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Thermal expansion

  1. Nov 3, 2013 #1
    In the harmonic approximation, why is the volume of a crystal not temperature dependent? Does it have something to do with the fact that the amplitude of a harmonic oscillator is independent of the frequency?
  2. jcsd
  3. Nov 3, 2013 #2


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    Science Advisor

    No, but the mean deviation from the equilibrium position ##\langle q \rangle_T=0 ## in the harmonic approximation. So the volume won't change on the mean.
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