![]() ![]() The conversions between a frequency f and an angular velocity ω are: The superseded standard ISO 80000-3:2006 did however state with reference to the unit name 'one', symbol '1', that "The special name revolution, symbol r, for this unit is widely used in specifications on rotating machines."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. 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 with the notation min −1) is a unit of rotational speed or rotational frequency for rotating machines. JSTOR ( July 2016) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Revolutions per minute" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. ![]()
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