And while we're on the subject. RPM already plural, so there is no such thing as RPMs. Let me explain: RPM - Revolutions per minute. See, "revolutions" is already a plural noun, so there is no need to say "750 RPMs," but you may say "750 RPM." Because you would never say "750 revolutions per minutes," but you do say "750 revolutions per minute." In short: 750 RPM - correct 750 RPMs - incorrect 750 RPM's - also incorrect 750 RPM - correct Thank you, that's all for now. Next week we discuss RPM's close cousin, PMS. Class dismissed. Chris. |
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