Can classical mechanics be derived from quantum mechanics as the same way thermodynamics derived from statistical mechanics?
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asked Aug 16, 2013 at 8:19
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1$\begingroup$ Possible duplicates: physics.stackexchange.com/q/65964/2451 , physics.stackexchange.com/q/17651/2451 and links therein. $\endgroup$– Qmechanic ♦Commented Aug 16, 2013 at 8:31
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3$\begingroup$ 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-KCommented Aug 16, 2013 at 9:02
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