Periodicity
821728
218781511
2008-06-12T03:42:35Z
Mendaliv
200402
Reverted edits by [[Special:Contributions/71.113.58.199|71.113.58.199]] to last version by Biscuittin (using [[WP:HG|Huggle]])
'''Periodicity''' is the quality of occurring at regular intervals or periods (in [[time]] or [[space]]) and can occur in different contexts:
* A [[clock]] marks time at periodic intervals.
* A [[metronome]] ticks at periodic intervals of time.
* A publication published at periodic intervals can be called a "periodical", for example a [[magazine]].
* In mathematics, a function whose output contains values that repeat periodically is called a [[periodic function]].
* In chemistry, the [[periodic table]] is a table which classifies the chemical elements by means of the periodicity of their chemical properties.
* In physics, [[period (physics)|period]] is the number of cycles as a result of time (time/cycle). The amount of time it takes to complete one full revolution. Period is also the inverse of frequency.
* In [[music theory]], periodicity is described as "predictability gives rise to expectations".
* [[Standing waves]] crest at periodic intervals of distance.
* In [[finance]], the periodicity of a loan describes the interval between payments.
The measure of periodicity in time is [[frequency]] which has the metric units of [[Hertz]].
== See also ==
* [[Cycle]]
* [[Frequency (disambiguation)]]
* [[Simultaneity]]
* [[Synchronicity]]
* [[Utility frequency]]
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