Re: Entropy question

Craig Franck wrote: 
I remember reading an account of the fact that when a gas expands
in a container entropy goes up, but when gas and dust clouds in
space do the opposite and condense, entropy increases as well. (I
think it was in a Roger Penrose book.)

Why exactly is this? From a statistical POV, I don't see how N
number of particles know which kind of system they are participating
in or if they are behaving in the most likely way.


  Entropy
    http://scienceworld.wolfram.com/physics/Entropy.html

  Look at the rolls of heat and temperature.
.

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