yes, teacher... but rpms has become colloquial... an accepted part of
everyday speech.  like irregardless... that was never a word until enough
people started to use it that it became acceptable, meaning the same thing
as regardless.

mick
hilo

----- Original Message -----
From: Chris Stann <ChrisS@INFORMS.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, May 25, 2001 3:03 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.
>