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Re: [Phys-l] Temp & Energy density

You are postulating a non-thermodynamic situation. Our chemistry friend have been busy with the thermodynamics of few-particle systems (Terence Hill has been publishing on this since the '60's) One does themod by imagining large collections of small systems, and averaging over these.

In your case there will always be some systems where molecules are bouncing off the piston, so the pressure is never zero (although fluctuations are large).
"Trust me. I have a lot of experience at this."
General Custer's unremembered message to his men,
just before leading them into the Little Big Horn Valley

On Mon, 3 Aug 2009, Paul Lulai wrote:

I have a bit of a grasp of some of these issues (I must admit I need
to study entropy quite a bit more). I understand that the situation
is very contrived and less than likely. Regardless, there appears to
be a difference btn what would happen through the lack of work done to
gas particles (no temp change) and the increase in temp due to
increased energy density.

If the piston is pushed down when Not incontact with any gasses, then
no work, but a larger energy density.
No work implies no change in temp.
Larger energy density implies increase in temp.

Are there any assumptions for energy density relating to temp?

Sent from my iPod so I can blame Apple for my typos.

Paul Lulai
St. Anthony Village Senior High
US First RoboHuskie Team 2574

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