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Re: Entropy and states of matter



Would your 'explanation' go over any better if you could show a
liquid/solid interface where the SOLID has more entropy than the
LIQUID?

If so, look up 3He in the milliKelvin range. This entropy effect is
what allows for Pomeranchuk cooling of a liquid/solid mix. See Noble
citation for 1996, for work done in early '70's utilizing this effect.



At 8:30 AM -0800 on 2/25/02, John Mallinckrodt wrote
I'm not sure I understand the question. The entropy of a gas (or
liquid) does decrease when it condenses (or solidifies) but the
evolved heat serves to increase the entropy of the surroundings by
at least as much.

Is this the explanation you've given in the past? If not, what
was it? And if so, why do you think students are so much more
skeptical this year?

John Mallinckrodt mailto:ajm@csupomona.edu
Cal Poly Pomona http://www.csupomona.edu/~ajm

On Mon, 25 Feb 2002, Malot, Woody wrote:

I need to find a good way to explain that entropy increase is not violated
when a material goes from a liquid or gas (disorder) to a solid (highly
ordered). Any ideas? This years class does not seem to accept the normal
> explaniations that I have used in the past.
> woody malot

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