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Entropy 2008, 10(3), 380-390;

The Second Entropy: A Variational Principle for Time-dependent Systems

School of Chemistry F11, University of Sydney, NSW 2006 Australia
Received: 3 May 2008 / Accepted: 4 September 2008 / Published: 25 September 2008
View Full-Text   |   Download PDF [158 KB, uploaded 24 February 2015]


The fundamental optimization principle for non-equilibrium thermodynamics is given. The second entropy is introduced as the quantity that is maximised to determine the optimum state of a non-equilibrium system. In contrast, the principles of maximum or minimum dissipation, which have previously been proposed by Onsager, Prigogine, and others as the variational principle for such systems, are shown to be incapable of fulfilling that rôle. View Full-Text
Keywords: entropy; second law; non-equilibrium entropy; second law; non-equilibrium
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Attard, P. The Second Entropy: A Variational Principle for Time-dependent Systems. Entropy 2008, 10, 380-390.

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