Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network

  Advanced Search  

Entropy 2008, 10, 380-390; DOI: 10.3390/e10030380 OPEN ACCESS

Summary: Entropy 2008, 10, 380-390; DOI: 10.3390/e10030380
ISSN 1099-4300
The Second Entropy: A Variational Principle for
Time-dependent Systems
Phil Attard
School of Chemistry F11, University of Sydney, NSW 2006 Australia
E-mail: attard@chem.usyd.edu.au
Received: 3 May 2008 / Accepted: 4 September 2008 / Published: 25 September 2008
Abstract: 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 mini-
mum 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 r^ole.
Keywords: entropy, second law, non-equilibrium
1. Introduction
The second entropy is a a new type of entropy that has been introduced by the author for non-
equilibrium systems. The concept has emerged from a theory for non-equilibrium thermodynamics


Source: Attard, Phil - School of Chemistry, University of Sydney


Collections: Chemistry