Although an unambiguous definition of heat is available for closed systems, the question of how best
to define heat in open systems is not yet settled.
After introducing a set of physical requirements for the definition of heat, this article reviews the
non-equivalent definitions of heat for open systems used by Callen, Casas-Vázquez, DeGroot,
Fox, Haase, Jou, Kondepudi, Lebon, Mazur, Misner, Prigogine, Smith, Thorne, and
Wheeler, emphasizing which physical requirements are not met.
A subsequent section deals with the main objective of this article and introduces a new definition of
heat that avoids the difficulties of the existent definitions, providing (i) a complete distinction between
open and closed systems, (ii) non-redundancy, (iii) natural variables for the thermodynamic potentials,
and (iv) a sound, complete, and intuitive generalization of classical thermodynamic expressions.
Primary Language | English |
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Journal Section | Regular Original Research Article |
Authors | |
Publication Date | September 5, 2013 |
Published in Issue | Year 2013 Volume: 16 Issue: 3 |