Revolutions per minute (abbreviate rpm, RPM, r/min, or r·min−1) is a unit of frequency: the number of full rotations completed in one minute around a fixed axis. It is most commonly used as a measure of rotational speed or angular velocity of some mechanical component.

Trivia about rpm

  • (Alex gives the clue from inside the car on the Toyota Pro/Celebrity Race track in Long Beach, CA.) The dashboard has a light which tells you the best moment to shift, like when the engine hits 6,000 of these