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Thermodynamics: Where exactly does microscopic turn to macroscopic?

  1. Sep 9, 2011 #1
    Looking for a rough distance scale over which statistical methods begin to work, and macroscopic thermodynamic variables begin to make sense. Thanks
  2. jcsd
  3. Sep 9, 2011 #2


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    It is rather not distance scale, but number of particles involved.

    It depends on how subtle effects you want to describe.
    Sometimes 100 particles may be successfully treated as a thermodynamical continuum, sometimes 1012 or so still produce visible effects (Brownian moves) beyond continous thermodynamics.
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