Revolutions per minute
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Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min) is a measure of the
According to the
Formally, hertz (Hz) and radian per second (rad/s) are two different names for the same SI unit, s−1. However, they are used for two different but proportional
Thus a disc rotating at 60 rpm is said to be rotating at either 2π rad/s or 1 Hz, where the former measures the angular velocity and the latter reflects the number of revolutions per second.
If the non-SI unit rpm is considered a unit of frequency, then 1 rpm = 1/ Hz. If it instead is considered a unit of angular velocity and the word "revolution" is considered to mean