The Plural of RPM

[foremangraphics at juno.com]

Tom -

I can foresee a time when you might want to use the plural of RPM. You
might say something on the order of "All standard RPMs are covered.... 
." The problem, as I see it, is the the use of the apostrophe. That makes
it a possessive and not a plural.

Just some more food for thought.

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On Tue,  2 May 2006 14:03:48 -0400 (EDT) "tom.green at iwon.com"
<tom.green at iwon.com> writes:
> 
> 
> I'm having a back-and-forth with an engineer about how to write more 
> than one RPM. She wants to write, "RPM's." I freaked and said, "No, 
> that would be saying, it's the Rotation Per Minute's problem." 
> I know, it doesn't make sense.
> I want to simply write RPM, meaning Rotations Per Minute. 
> 
> Am I correct or is there another way?
> 
> I also hate to apply the possessive to an inanimate object or a 
> company for example, "IBM's net worth." Is there a rule about that, 
> or is that just me?