Q:

What is meant by the term revolutions per minute?

A:

Quick Answer

The term revolutions per minute refers to the frequency or rate of speed at which an object orbits or rotates around a fixed axis or another object. It is the number of times each minute that an object spins or moves around its center or another object.

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Full Answer

Manufacturers standardized the rotational speeds of phonograph records at 33 1/3, 45 and 78 revolutions per minute and used these numbers to indicate the size and length of a recording. A single, or 45, usually contains one song on each side of a 7-inch disc that spins at a speed of 45 r.p.m., while an LP contains a full album on a 12-inch disc that spins at 33 1/3 rpm.

In contemporary usage, manufacturers of computer drives often express disc speeds as 5400 or 7200 r.p.m.

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