Abstract
In thermodynamics the difference in entropy of two states I and II is given by
where δQ is the heat supplied. The index “rev” means that the transition from I to II has to be carried out in a reversible way. If the quantum mechanical ground state E 0 of the system is nondegenerate, the quantum theoretical phase volume Φ(E) approaches 1 for E just above E 0, which means that the entropy, S & klnΦ, approaches zero. The entropy of the ground state can then be normalized to zero and one can define an absolute value of S by starting from the ground state E 0 or from \(T = 0\left( {{S_1} = {S_{{E_o}}} = 0} \right)\):
.
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© 1955 Springer-Verlag Berlin · Heidelberg
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Becker, R. (1955). Fluctuations and Brownian Motion. In: Theory of Heat. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-49255-6_6
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DOI: https://doi.org/10.1007/978-3-642-49255-6_6
Publisher Name: Springer, Berlin, Heidelberg
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Online ISBN: 978-3-642-49255-6
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