Editing 594: Period
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==Explanation== | ==Explanation== | ||
β | A period, also called a {{w|Menstruation|menstrual cycle}}, is a process marked by (among other things) a few days of abdominal cramps occurring roughly once a month for women in the {{w | + | A period, also called a {{w|Menstruation|menstrual cycle}}, is a process marked by (among other things) a few days of abdominal cramps occurring roughly once a month for women in the {{w|reproductive age}}. |
"Period" (''T'') is also the term in mathematics for a measure of the rate at which something happens. It measures the length of time between occurrences. For example, a full moon happens about once every 29.5 days, so its period is 29.5 days. By taking the inverse of this, we can get a different measurement, its {{w|frequency}} (''f'') - the number of times an event happens within a given length of time. This is usually measured in hertz (pronounced the same as "hurts"), which is the number of times something happens in a second. Hertz is abbreviated as Hz, and since f = 1/T, with ''T'' measured in seconds (s), it follows that 1 Hz = 1 s<sup>−1</sup>. | "Period" (''T'') is also the term in mathematics for a measure of the rate at which something happens. It measures the length of time between occurrences. For example, a full moon happens about once every 29.5 days, so its period is 29.5 days. By taking the inverse of this, we can get a different measurement, its {{w|frequency}} (''f'') - the number of times an event happens within a given length of time. This is usually measured in hertz (pronounced the same as "hurts"), which is the number of times something happens in a second. Hertz is abbreviated as Hz, and since f = 1/T, with ''T'' measured in seconds (s), it follows that 1 Hz = 1 s<sup>−1</sup>. |