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The '''inverse second''', '''reciprocal second''', or '''per second''' (s<sup>−1</sup>) is a unit of [[frequency]], defined as the [[multiplicative inverse]] of the [[second]] (a unit of time). It is [[dimensional analysis|dimensionally]] equivalent to:
* the unit [[hertz]] – the SI unit for [[frequency]]
* the unit [[radian per second]] – the SI unit for [[angular frequency]] and [[angular velocity]]
* the unit [[becquerel]] – the SI unit for aperiodic or stochastic [[radioactivity|radionuclide]] events per second
* the unit [[baud]] – the unit for [[symbol rate]] over a communication link
* the unit of [[strain rate]] – the velocity gradient (comprising the [[shear rate]] and directional expansion rate) of a fluid or solid
==See also==
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