Re: [Phys-l] Temp & Energy density

[Jack Uretsky <jlu@hep.anl.gov>]

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).
				Regards,
					Jack
"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
> Http://prettygoodphysics.wikispaces.com
> US First RoboHuskie Team 2574
>
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