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]] {{dab}} [[de:Periodizität]] [[nl:Periodiek (tijd)]] [[ru:Периодичность]]