Inverse second
The inverse second or reciprocal second (s−1), also called per second, is a unit of frequency, defined as the multiplicative inverse of the second (a unit of time). It is dimensionally equivalent to:
- hertz (Hz) – the SI unit for frequency
- becquerel (Bq) – the SI unit for the rate of occurrence of aperiodic or stochastic radionuclide events
- baud (Bd) – the unit for symbol rate over a communication link
- strain rate.
- bits per second (bps or bit/s) – the unit of bit rate
It is also related to radian per second (rad⋅s−1), the SI unit for angular frequency and angular velocity.
The inverse minute or reciprocal minute (min−1), also called per minute, is 60-1 s−1, as 1 min = 60 s; it is used in quantities of type "counts per minute", such as:
It is also related to revolutions per minute (RPM).
See also
References
- "The SI unit of frequency is given as the hertz, implying the unit cycles per second; the SI unit of angular velocity is given as the radian per second; and the SI unit of activity is designated the becquerel, implying the unit counts per second. Although it would be formally correct to write all three of these units as the reciprocal second, the use of the different names emphasises the different nature of the quantities concerned." "Units with special names and symbols; units that incorporate special names and symbols".
- "(d) The hertz is used only for periodic phenomena, and the becquerel (Bq) is used only for stochastic processes in activity referred to a radionuclide." "BIPM - Table 3". BIPM. Retrieved 2012-10-24.
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