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-----Original Message-----
From: Joseph Bellina [mailto:jbellina@SAINTMARYS.EDU]
Sent: Wednesday, August 21, 2002 5:32 PM
To: PHYS-L@lists.nau.edu
Subject: Re: multi-step reasoning
With all do respect, zero pressure does not exist, and zero pressure
difference is not zero pressure...I can't think of a case in which
changing the volume doesn't involve work being done.