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Can classical mechanics be derived from quantum mechanics as the same way thermodynamics derived from statistical mechanics?

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    $\begingroup$ Possible duplicates: physics.stackexchange.com/q/65964/2451 , physics.stackexchange.com/q/17651/2451 and links therein. $\endgroup$
    – Qmechanic
    Aug 16 '13 at 8:31
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    $\begingroup$ I guess check "Ehrenfest theorem" on wikipedia. As a side note, I'm always an advocate of making people cautious to not merely view thermodynamics as that what you get when you view statistical mechanics on a broader scale, but as a theory on it's own. Certain expression from the detailed theory can be interpreted in a way so that they fulfill the thermodynamical axioms and so the macroscopic structure sits on the surface of the microscopic one. But as far as I'm concerned, the theory of thermodynamics doesn't even have to be used for only describing situations in physics. $\endgroup$
    – Nikolaj-K
    Aug 16 '13 at 9:02