Re: Is it true that when you mix two volumes of identical gas, there is no entropy change?

On 9/27/05 6:50 PM, in article
1127872213.691418.202680@xxxxxxxxxxxxxxxxxxxxxxxxxxxx, "simondex@xxxxxxxxx"
<simondex@xxxxxxxxx> wrote:

> In my understanding, entropy is number of states the system can be in.
> I did not know about the significance of knowing the number of
> molecules. If you could elaborate on the importance of information
> (negentropy) I would highly appreciate it.
>
Look at a good book on information theory. The similarity between
information and entropy is used to explain why a Maxwell daemon cannot end
up in violation of the second law. The information needed by the daemon to
know when to let a high speed particle through the door can only come at the
expense of increasing the entropy.

Bill

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