The Plural of RPM

Subject: The Plural of RPM
From: "tom -dot- green -at- iwon -dot- com" <tom -dot- green -at- iwon -dot- com>
To: techwr-l -at- lists -dot- techwr-l -dot- com
Date: Tue, 2 May 2006 14:03:48 -0400 (EDT)

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?



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