Re: Ludwig Boltzmann, entropy

Paul J Gans <gans@xxxxxxxxx> wrote or quoted:
> Tim Tyler <tim@xxxxxxxxxxx> wrote:

> >We don't know how many particles there are in any region
> >of space either. How many neutrinos are there in the
> >diamond you mentioned. How many gravitons? Each particle
> >contributes to the entropy of the system and the number of
> >possible states it can take up - yet nobody has a clear
> >idea of how many particles there are in any region of
> >spacetime.
>
> This is wrong. We don't know about them because they
> *don't* contribute to the thermodynamics of the system
> at all.

We were talking about the number of microstates in a
system. Each neutrino has a position and momentum -
like any other particle - and consequently adds to
the microstates avaible to any system that includes
them.

> You have got to come to grips with this.

Please stop telling me what to do.

> Things like energy and entropy depends on the ability of
> a system to move from one energy state to another.
> Neutrinos, for example, are so weakly coupled to other
> forms of matter that we can't do *anything* to them short
> of using a mountain-sized neutrino detector.
>
> In other words, they just don't count.

It's not clear to me what you think this has to to
with the number of microstates in the system.

Presumably you're still sticking to the classical
notion that thermodynamics allows you to derive the
entropy of a system from its pressure and temperature -
and therefore caluclate its microstates.

As you may have gathered, I do not think that's a
realistic way to calculate the entropy or number
of states actually present in any real physical system.
--
__________
|im |yler http://timtyler.org/ tim@xxxxxxxxxxx Remove lock to reply.

.

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