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From: mam@charm.UUCP (Matthew Marcus)
Newsgroups: net.physics
Subject: Re: Thermodynamics and probability
Message-ID: <294@charm.UUCP>
Date: Fri, 30-Mar-84 16:59:04 EST
Article-I.D.: charm.294
Posted: Fri Mar 30 16:59:04 1984
Date-Received: Sat, 31-Mar-84 09:23:31 EST
References: <936@ihuxm.UUCP>, <2833@brl-vgr.ARPA>, <9@entropy.UUCP>
Organization: Physics Research - AT&T Bell Labs MH
Lines: 10

Entropy!alan claims that the paths of molecules in gases aren't even differentiable,
much less explainable by micro-dynamic.  Sorry, that's rubbish!  True, if
you look *at a certain length scale*, the paths appear pretty noisy, but they
are quite continuous and differentiable when examined with resolution below
the mean free path.  For a hard-sphere gas, the path is non-differentiable
at the collision points, but there's no such thing as a hard-sphere gas,
except inside a computer.  That reminds me, lots pf people use molecular
dynamics (integrating micro equations of motion on a computer) to explain
macro properties of gases, liquids, and solids.
	{BTL}!charm!mam