rpm (unit)

Physical unit
Unit name	rpm (revolutions per minute)
Unit symbol	${\displaystyle \mathrm {rpm} }$
Physical quantity (s)	rotational speed
Formula symbol	${\displaystyle n,\,f_{\mathrm {rot} }}$
dimension	${\displaystyle {\mathsf {T^{-1}}}}$
system	Anglo-American system of measurement
In SI units	${\displaystyle \mathrm {60\;rpm={60\;min^{-1}}={1\;s^{-1}}} }$
Named after	english revolutions per minute
Derived from	minute

rpm ( English revolutions per minute ; "revolutions per minute") is an Anglo-American unit in mechanics for speed . In the case of a rotary axis , for example, this indicates the number of revolutions in a time period based on this time period. ${\displaystyle n}$

The German unit of measurement for rpm is 1 / min (= 1 min ⁻¹ ) ${\displaystyle n}$

${\displaystyle 1\,{\text{rpm}}={\frac {1}{\text{min}}}={\frac {1}{60\,{\text{s}}}}\;.}$

According to the SI system of units , the specification in the unit 1 / s is intended, but rarely used; according to DIN 1301, the Hertz unit is not to be used for the speed.

The special name rotation (unit symbol r, in German-speaking countries U) is usually used instead of one as a unit in the specification for rotating machines. Accordingly, the unit "revolutions per minute" (unit symbol rpm) is widely used for speed.

If you look at a point on a component rotating with the axis, it moves with the angular velocity . ${\displaystyle \omega =2\pi \,n}$

One belongs to one ${\displaystyle n=\{n\}\,{\text{rpm}}}$ ${\displaystyle \omega =\{n\}\ {\frac {2\pi }{60\,{\text{s}}}}\approx 0{,}1\,\{n\}\,{\text{s}}^{-1}\;.}$

It stands for the numerical value of the speed in the unit used. ${\displaystyle \{n\}}$

Individual evidence

1. ↑ Almost literally from DIN EN ISO 80000-3: 2013-08 Sizes and Units - Space and Time , Nos. 3–14a and 3–15b