A description of the speed of movement of a disc or other circular object. Usually used with reference to wheels, disk drives, phonograph records or engines or similar things that spin.

Revolutions Per Minute (abbreviated rpm, RPM, r/min, or r·min−1) is a unit of frequency of rotation: the number of full rotations completed in one minute around a fixed axis. It is used as a measure of rotational speed of a mechanical component.

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