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		<id>https://www.explainxkcd.com/wiki/index.php?action=history&amp;feed=atom&amp;title=3094%3A_Mass_Spec</id>
		<title>3094: Mass Spec - Revision history</title>
		<link rel="self" type="application/atom+xml" href="https://www.explainxkcd.com/wiki/index.php?action=history&amp;feed=atom&amp;title=3094%3A_Mass_Spec"/>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;action=history"/>
		<updated>2026-04-15T12:45:06Z</updated>
		<subtitle>Revision history for this page on the wiki</subtitle>
		<generator>MediaWiki 1.30.0</generator>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=389980&amp;oldid=prev</id>
		<title>2001:4C4E:1C0D:F000:1C6F:94EC:A135:CA8E: /* Explanation */</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=389980&amp;oldid=prev"/>
				<updated>2025-11-01T06:11:48Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 06:11, 1 November 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l14&quot; &gt;Line 14:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 14:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio by firing them through a magnetic field (jumping past the magnet), and observing the resulting amount of path deflection on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular. There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio by firing them through a magnetic field (jumping past the magnet), and observing the resulting amount of path deflection on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular. There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|Oil drop experiment|&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;Milliken-Fletcher &lt;/del&gt;procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|Oil drop experiment|&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;Milliken–Fletcher &lt;/ins&gt;procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>2001:4C4E:1C0D:F000:1C6F:94EC:A135:CA8E</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=381506&amp;oldid=prev</id>
		<title>FaviFake: oh i'm sure</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=381506&amp;oldid=prev"/>
				<updated>2025-07-19T17:10:24Z</updated>
		
		<summary type="html">&lt;p&gt;oh i&amp;#039;m sure&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 17:10, 19 July 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l10&quot; &gt;Line 10:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 10:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The domestic bathroom scale (initially a form of {{w|spring scale}}) was only introduced to US customers in the early 1920s. Although means to ascertain the weight of the human body existed before the 1920s,&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;{{Citation needed}} &lt;/del&gt;they were not in common use and were not thought necessary in routine physical and medical examinations. The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology which were actually used, but by absurd, Rube Goldberg-esque, implementations of {{w|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The domestic bathroom scale (initially a form of {{w|spring scale}}) was only introduced to US customers in the early 1920s. Although means to ascertain the weight of the human body existed before the 1920s, they were not in common use and were not thought necessary in routine physical and medical examinations. The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology which were actually used, but by absurd, Rube Goldberg-esque, implementations of {{w|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio by firing them through a magnetic field (jumping past the magnet), and observing the resulting amount of path deflection on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular.&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;{{Citation needed}} &lt;/del&gt;There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio by firing them through a magnetic field (jumping past the magnet), and observing the resulting amount of path deflection on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular. There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|Oil drop experiment|Milliken-Fletcher procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|Oil drop experiment|Milliken-Fletcher procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>FaviFake</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=380610&amp;oldid=prev</id>
		<title>92.23.2.228: Reposition CNs to punctuation. Dealiasing. (Not sure there should be two of them, though.) Other minor cleanups.</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=380610&amp;oldid=prev"/>
				<updated>2025-06-29T23:17:45Z</updated>
		
		<summary type="html">&lt;p&gt;Reposition CNs to punctuation. Dealiasing. (Not sure there should be two of them, though.) Other minor cleanups.&lt;/p&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 23:17, 29 June 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l10&quot; &gt;Line 10:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 10:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The domestic bathroom scale (initially a form of {{w|spring scale}}) was only introduced to US customers in the early 1920s. Although means to ascertain the weight of the human body existed before the 1920s{{&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;cn&lt;/del&gt;}}&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;, &lt;/del&gt;they were not in common use and were not thought necessary in routine physical and medical examinations. The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology which were actually used, but by absurd, Rube Goldberg-esque, implementations of {{w&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;|Mass_spectrometry&lt;/del&gt;|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The domestic bathroom scale (initially a form of {{w|spring scale}}) was only introduced to US customers in the early 1920s. Although means to ascertain the weight of the human body existed before the 1920s&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;,&lt;/ins&gt;{{&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;Citation needed&lt;/ins&gt;}} they were not in common use and were not thought necessary in routine physical and medical examinations. The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology which were actually used, but by absurd, Rube Goldberg-esque, implementations of {{w|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio by firing them through a magnetic field (jumping past the magnet), and observing the resulting amount of path deflection on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular{{&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;cn&lt;/del&gt;}}&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;. &lt;/del&gt;There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio by firing them through a magnetic field (jumping past the magnet), and observing the resulting amount of path deflection on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;.&lt;/ins&gt;{{&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;Citation needed&lt;/ins&gt;}} There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;Oil_drop_experiment&lt;/del&gt;|Milliken-Fletcher procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;Oil drop experiment&lt;/ins&gt;|Milliken-Fletcher procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:[Ponytail, wearing a lab coat, is giving a balloon to Cueball. Behind Cueball, there is a ramp on the ground, a magnet hanging from the ceiling&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;, &lt;/del&gt;and a target on a poster on the wall.]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:[Ponytail, wearing a lab coat, is giving a balloon to Cueball. Behind Cueball, there is a ramp on the ground, a magnet hanging from the ceiling and a target on a poster on the wall.]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:Ponytail: Rub this balloon against your head, then go jump past that magnet toward the target on the wall.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:Ponytail: Rub this balloon against your head, then go jump past that magnet toward the target on the wall.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>92.23.2.228</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=380607&amp;oldid=prev</id>
		<title>Whoop whoop pull up: /* Explanation */</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=380607&amp;oldid=prev"/>
				<updated>2025-06-29T20:49:13Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 20:49, 29 June 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l10&quot; &gt;Line 10:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 10:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The domestic bathroom scale (initially a form of {{w|spring scale}}) was only introduced to US customers in the early 1920s. Although means to ascertain the weight of the human body existed before the 1920s, they were not in common use and were not thought necessary in routine physical and medical examinations. The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology which were actually used, but by absurd, Rube Goldberg-esque, implementations of {{w|Mass_spectrometry|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The domestic bathroom scale (initially a form of {{w|spring scale}}) was only introduced to US customers in the early 1920s. Although means to ascertain the weight of the human body existed before the 1920s&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;{{cn}}&lt;/ins&gt;, they were not in common use and were not thought necessary in routine physical and medical examinations. The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology which were actually used, but by absurd, Rube Goldberg-esque, implementations of {{w|Mass_spectrometry|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio by firing them through a magnetic field (jumping past the magnet), and observing the resulting amount of path deflection on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular{{cn}}. There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio by firing them through a magnetic field (jumping past the magnet), and observing the resulting amount of path deflection on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular{{cn}}. There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Whoop whoop pull up</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=380335&amp;oldid=prev</id>
		<title>2603:8080:BD00:5703:DA8:CD88:5D30:6397: Removed the incomplete transcript notice, transcript seems good.</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=380335&amp;oldid=prev"/>
				<updated>2025-06-25T00:10:18Z</updated>
		
		<summary type="html">&lt;p&gt;Removed the incomplete transcript notice, transcript seems good.&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 00:10, 25 June 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l17&quot; &gt;Line 17:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 17:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;{{incomplete transcript|Don't remove this notice too soon.}}&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:[Ponytail, wearing a lab coat, is giving a balloon to Cueball. Behind Cueball, there is a ramp on the ground, a magnet hanging from the ceiling, and a target on a poster on the wall.]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:[Ponytail, wearing a lab coat, is giving a balloon to Cueball. Behind Cueball, there is a ramp on the ground, a magnet hanging from the ceiling, and a target on a poster on the wall.]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:Ponytail: Rub this balloon against your head, then go jump past that magnet toward the target on the wall.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:Ponytail: Rub this balloon against your head, then go jump past that magnet toward the target on the wall.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>2603:8080:BD00:5703:DA8:CD88:5D30:6397</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=379530&amp;oldid=prev</id>
		<title>FaviFake: /* Transcript */ belongs to trivia</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=379530&amp;oldid=prev"/>
				<updated>2025-06-16T12:45:35Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Transcript: &lt;/span&gt; belongs to trivia&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 12:45, 16 June 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l23&quot; &gt;Line 23:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 23:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:[Caption below the panel:]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:[Caption below the panel:]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:Before the bathroom scale was invented, the only way to weigh people was mass spectrometry.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:Before the bathroom scale was invented, the only way to weigh people was mass spectrometry.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;==Trivia==&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;In the comic, Randall uses the correct term &amp;quot;mass spectro'''metry'''&amp;quot;. The term &amp;quot;mass spectro'''scopy'''&amp;quot; was used in the beginnings of the technique but is not used anymore. Today, a spectroscopy method entails the interaction of matter with electromagnetic radiation (e.g. IR light — as in IR spectroscopy or radio waves — as in NMR spectroscopy, nuclear magnetic resonance spectroscopy). In the case of mass spectrometry, this is not the case, as ions are manipulated or interacting with static electric and magnetic fields and thereby the mass-to-charge ratio is determined. Both &amp;quot;spectrometry&amp;quot; and &amp;quot;spectroscopy&amp;quot; allude to a &amp;quot;spectrum&amp;quot; of possible results that can be used to quantify and qualify any inputs being measured, and a distribution of molecular weights ''can'' be usefully represented in a rainbow-like visual, but doesn't bear any direct relation with the electromagnetic spectrum, hence the technical name difference. People &amp;quot;in the trade&amp;quot; often abbreviate it as &amp;quot;mass spec&amp;quot;, which could stand for either term.&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{comic discussion}}&amp;lt;noinclude&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{comic discussion}}&amp;lt;noinclude&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>FaviFake</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=379529&amp;oldid=prev</id>
		<title>FaviFake: /* Explanation */ seems complete</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=379529&amp;oldid=prev"/>
				<updated>2025-06-16T12:44:07Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation: &lt;/span&gt; seems complete&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 12:44, 16 June 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l10&quot; &gt;Line 10:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 10:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;{{incomplete|This page was created by HARVEY FLETCHER (UNCREDITED). Don't remove this notice too soon.}}&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;The &lt;/ins&gt;domestic bathroom scale (initially a form of {{w|spring scale}}) was &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;only &lt;/ins&gt;introduced to &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;US &lt;/ins&gt;customers in the &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;early 1920s&lt;/ins&gt;. Although means to ascertain the weight of the human body existed before the 1920s, they were not in common use and were not thought necessary in routine physical &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;and &lt;/ins&gt;medical examinations. The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology which were actually used, but by absurd, Rube Goldberg-esque, implementations of {{w|Mass_spectrometry|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;In the early 1920s, the &lt;/del&gt;domestic bathroom scale (initially a form of {{w&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;|Spring_scale&lt;/del&gt;|spring scale}}) was introduced to customers in the &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;United States of America. The device soon became popular, and has remained so to the present&lt;/del&gt;. Although means to ascertain the weight of the human body existed before the 1920s, they were not in common use&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;, &lt;/del&gt;and were not thought necessary in routine physical &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;/ &lt;/del&gt;medical examinations.&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology which were actually used, but by absurd, Rube Goldberg-esque, implementations of {{w|Mass_spectrometry|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio by firing them through a magnetic field (jumping past the magnet), and observing the resulting amount of path deflection on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular{{cn}}. There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio by firing them through a magnetic field (jumping past the magnet), and observing the resulting amount of path deflection on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular{{cn}}. There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|Oil_drop_experiment|Milliken-Fletcher procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|Oil_drop_experiment|Milliken-Fletcher procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Note: Randall uses the correct term &amp;quot;mass spectrometry&amp;quot;. The term &amp;quot;mass spectroscopy&amp;quot; was used in the beginnings of the technique but is not used anymore. Today, a spectroscopy method entails the interaction of matter with electromagnetic radiation (e.g. IR light - as in IR spectroscopy or radio waves - as in NMR spectroscopy, nuclear magnetic resonance spectroscopy). In the case of mass spectrometry, this is not the case. Here, ions are manipulated or interacting with static electric and/or magnetic fields and thereby the mass-to-charge ratio is determined. Both &amp;quot;spectrometry&amp;quot; and &amp;quot;spectroscopy&amp;quot; allude to a &amp;quot;spectrum&amp;quot; of possible results that can be used to quantify and qualify any inputs being measured, and a distribution of molecular weights ''can'' be usefully represented in a rainbow-like visual, but doesn't bear any direct relation with the electromagnetic spectrum, hence the technical name difference. People &amp;quot;in the trade&amp;quot; often abbreviate it as &amp;quot;mass spec&amp;quot;, which could stand for either term.&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>FaviFake</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=378619&amp;oldid=prev</id>
		<title>172.70.160.161: /* Explanation */</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=378619&amp;oldid=prev"/>
				<updated>2025-05-29T08:48:05Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 08:48, 29 May 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l15&quot; &gt;Line 15:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 15:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology which were actually used, but by absurd, Rube Goldberg-esque, implementations of {{w|Mass_spectrometry|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology which were actually used, but by absurd, Rube Goldberg-esque, implementations of {{w|Mass_spectrometry|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio (the magnet), and observing the &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;result &lt;/del&gt;on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular{{cn}}. There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;by firing them through a magnetic field &lt;/ins&gt;(&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;jumping past &lt;/ins&gt;the magnet), and observing the &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;resulting amount of path deflection &lt;/ins&gt;on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular{{cn}}. There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|Oil_drop_experiment|Milliken-Fletcher procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|Oil_drop_experiment|Milliken-Fletcher procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>172.70.160.161</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=378618&amp;oldid=prev</id>
		<title>172.71.178.74: /* Explanation */</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=378618&amp;oldid=prev"/>
				<updated>2025-05-29T08:42:19Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 08:42, 29 May 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l13&quot; &gt;Line 13:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 13:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;In the early 1920s, the domestic bathroom scale (initially a form of {{w|Spring_scale|spring scale}}) was introduced to customers in the United States of America. The device soon became popular, and has remained so to the present. Although means to ascertain the weight of the human body existed before the 1920s, they were not in common use, and were not thought necessary in routine physical / medical examinations.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;In the early 1920s, the domestic bathroom scale (initially a form of {{w|Spring_scale|spring scale}}) was introduced to customers in the United States of America. The device soon became popular, and has remained so to the present. Although means to ascertain the weight of the human body existed before the 1920s, they were not in common use, and were not thought necessary in routine physical / medical examinations.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology used &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;IRL&lt;/del&gt;, but by absurd, Rube Goldberg-esque, implementations of {{w|Mass_spectrometry|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The joke in this comic arises from the claim that, before the invention of the &amp;quot;modern&amp;quot; bathroom scale, human body weights needed to be obtained, not by the earlier, less convenient, forms of scale technology &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;which were actually &lt;/ins&gt;used, but by absurd, Rube Goldberg-esque, implementations of {{w|Mass_spectrometry|mass spectrometry}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio (the magnet), and observing the result on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular{{cn}}. There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Mass spectrometry, a late 19th-century invention (thus, available only a few decades earlier than the bathroom scale), was developed to obtain the masses of atomic particles by ascertaining their mass-to-charge ratios. The basic steps, as represented in the comic, are ionization of the mass (rubbing the scalp with the balloon), separating the resulting particles on the basis of their mass-to-charge ratio (the magnet), and observing the result on a detector (the target). Since the ionization procedure for ''bona fide'' mass-spectrometry assays involves turning the mass to be analyzed into a gas, the method would quickly be recognized as unsuited for obtaining human body weights, especially over the course of a dieting program, and become unpopular{{cn}}. There are other ionization techniques to transfer larger compounds intact into the gas phase, but a human body would be way too heavy to be analyzable by this technique.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>172.71.178.74</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=378588&amp;oldid=prev</id>
		<title>BunsenH: /* Explanation */ mass spec</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3094:_Mass_Spec&amp;diff=378588&amp;oldid=prev"/>
				<updated>2025-05-28T17:00:06Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation: &lt;/span&gt; mass spec&lt;/span&gt;&lt;/p&gt;
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				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 17:00, 28 May 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l19&quot; &gt;Line 19:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 19:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|Oil_drop_experiment|Milliken-Fletcher procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The title text compares the mass-spectrometry-based method for obtaining human body weights with the method based on the {{w|Oil_drop_experiment|Milliken-Fletcher procedure}}, also available only a few years prior to bathroom scales, in which the mass to be analyzed takes the form of atomized oil droplets that are ionized by X-rays. Neither is suited for weight measurements over time scales of any length, but the cleanup procedures for a human body converted into ionized gas are certainly less onerous than those for a similar mass converted into an oil spray. The original procedure was intended to determine the mass of an electron, based on the known mass/density of the oil droplets. The title text seems to imply the converse, determining the mass/density of a person based on the (now) known mass of an electron.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Note: Randall uses the correct term &amp;quot;mass spectrometry&amp;quot;. The term &amp;quot;mass spectroscopy&amp;quot; was used in the beginnings of the technique but is not used anymore. Today, a spectroscopy method entails the interaction of matter with electromagnetic radiation (e.g. IR light - as in IR spectroscopy or radio waves - as in NMR spectroscopy, nuclear magnetic resonance spectroscopy). In the case of mass spectrometry, this is not the case. Here, ions are manipulated or interacting with static electric and/or magnetic fields and thereby the mass-to-charge ratio is determined. Both &amp;quot;spectrometry&amp;quot; and &amp;quot;spectroscopy&amp;quot; allude to a &amp;quot;spectrum&amp;quot; of possible results that can be used to quantify and qualify any inputs being measured, and a distribution of molecular weights ''can'' be usefully represented in a rainbow-like visual, but doesn't bear any direct relation with the electromagnetic spectrum, hence the technical name difference.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Note: Randall uses the correct term &amp;quot;mass spectrometry&amp;quot;. The term &amp;quot;mass spectroscopy&amp;quot; was used in the beginnings of the technique but is not used anymore. Today, a spectroscopy method entails the interaction of matter with electromagnetic radiation (e.g. IR light - as in IR spectroscopy or radio waves - as in NMR spectroscopy, nuclear magnetic resonance spectroscopy). In the case of mass spectrometry, this is not the case. Here, ions are manipulated or interacting with static electric and/or magnetic fields and thereby the mass-to-charge ratio is determined. Both &amp;quot;spectrometry&amp;quot; and &amp;quot;spectroscopy&amp;quot; allude to a &amp;quot;spectrum&amp;quot; of possible results that can be used to quantify and qualify any inputs being measured, and a distribution of molecular weights ''can'' be usefully represented in a rainbow-like visual, but doesn't bear any direct relation with the electromagnetic spectrum, hence the technical name difference&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;. People &amp;quot;in the trade&amp;quot; often abbreviate it as &amp;quot;mass spec&amp;quot;, which could stand for either term&lt;/ins&gt;.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>BunsenH</name></author>	</entry>

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