The second hand of a conventional analog clock rotates at 1 rpm.Modern air turbine dental drills can rotate at up to 800 000 rpm (13.3 kHz).Phonograph (gramophone) records, for example, typically rotate steadily at 16 + 2⁄ 3, 33 + 1⁄ 3, 45 rpm or 78 rpm (0.28, 0.55, 0.75, or 1.3, respectively, in Hz). On many kinds of disc recording media, the rotational speed of the medium under the read head is a standard given in rpm.A revolution is one complete period of motion, whether this be circular, reciprocating or some other periodic motion. For a wheel, a pump, or a crank shaft, the number of times that it completes one full cycle in one minute is given the unit revolution per minute. The conversions between a frequency f and an angular velocity ω are: Ī corresponding but distinct quantity for describing rotation is angular velocity, for which the SI unit is the radian per second.Īlthough they have the same dimensions (s −1), hertz (Hz) and radian per second (rad/s) are two different units and are used to measure two different but proportional ISQ quantities: frequency and angular frequency (angular speed, magnitude of angular velocity) respectively. It defines a unit of rotational frequency equal to s −1 ( reciprocal second). ISO 80000-3:2019 defines a unit of rotation as the dimensionless unit equal to 1, which it refers to as a revolution, but does not define the revolution as a unit. Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min −1) is a unit of rotational speed or rotational frequency for rotating machines.
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