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Since my contribution is not valued and appreciated. This will be my last post here. What really entropy is? Answer: Information or more precisely the inverse of information What is a major characteristic of entropy? Answer: The more even, the higher entropy (the less information). Now, let's get to the rigorous part. This definition of entropy will ...


The molecule has only 3*N (number of atoms) positional degrees of freedom, since every atom can move in 3 dimensions. Three of of the 3N are translations of the whole molecule, 3 are rotational and 3N-6 are vibrational (symmetry will even break these into invariant subspaces) Thus the partition function includes all relevant microstates in this definition.

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