RPMs

should we not add the S when saying rpm? cuz its rotations per minute, not rotations per minuteS.

No, we are talking about 1 minute. "10,000 revolutions per minute". It would sound so stupid to say "10,000 revolution per minutes" now wouldn't it?
 
maybe if you're talking about two engines, say you're trying to match engine speed "We need to match their RPMs". Otherwise, there's only one RPM whether the value is 0, 1, or 100000, it's only a single reading.
 
No, we are talking about 1 minute. "10,000 revolutions per minute". It would sound so stupid to say "10,000 revolution per minutes" now wouldn't it?

This is wat OP is suggesting, reads like he is saying the opposite though. He wants RPM and not RPMs.
 

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