Revolutions per minute

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¼ 15
½ 30
1 60
2 120
5 300
10 600
25 1500

Revolutions per minute, sometimes called RPM, is a measure of angular frequency. It means the number of times something spins in one minute.

For example, if a wheel spins one time in one second, it is doing 60 RPM, because there is 60 seconds in one minute.