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Internal energy's lower bound

  1. Oct 9, 2015 #1
    Thermodynamics question:

    Why does the internal energy have a lower bound?

    I tried to explain it using postulates, but cannot get the connection between the postulates. Please do explain it briefly. Thank you.
  2. jcsd
  3. Oct 9, 2015 #2


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    Homework Helper

    An oscillatory system has got a lower bound. It can not be explained in the frames of Classical Physics, but comes out from Quantum Mechanics. The lowest energy of an oscillator vibrating with frequency f is hf/2, called the zero-point energy of the oscillator.
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