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Reference.org
Revolutions per minute
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<p>Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min−1) is a unit of <a href="/facts/Rotational_speed/DAVXQgXj">rotational speed</a> (or <a href="/facts/Rotational_frequency/VqLm3L3R">rotational frequency</a>) for rotating machines. One revolution per <a href="/facts/Minute/WTRsLrWy">minute</a> is equivalent to 1/60 <a href="/facts/Hertz/6Wshj5qm">hertz</a>. </p>