Huh?

What about the second hand on my clock????

It seems to travel at 1 rpm, and that would be singular.

In order to be technically correct, that should be:

1 RPM = correct
750 RPM = acceptable, though incorrect
750 RsPM = unacceptable, though correct

Karl Wolz
----- Original Message -----
From: "Chris Stann" <ChrisS@INFORMS.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, May 25, 2001 6:03 PM
Subject: Re: Apostrophes & spelling - RPMs? not

> 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.