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Phys. Rev. 91, 1512–1515 (1953)

Fluctuations and Irreversible Process. II. Systems with Kinetic Energy

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S. Machlup
Sloane Physics Laboratory, Yale University, New Haven, Connecticut, and Bell Telephone Laboratories, Murray Hill, New Jersey

L. Onsager
Sterling Chemistry Laboratory, Yale University, New Haven, Connecticut

Received 13 May 1953; published in the issue dated September 1953

The results of the previous paper are extended to second-order systems, i.e., systems with inertia. Using a generalized definition of the thermodynamic forces, reciprocal relations for the dissipative coefficients in the equations describing irreversible processes are derived. A dissipation function can again be defined, and it can again be used to express the probability functional for fluctuations.

© 1953 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRev.91.1512
DOI:
10.1103/PhysRev.91.1512
PACS: