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Portions of this entry contributed by Peter J. Walsh
An ensemble of systems in contact with a heat reservoir for which and or and are specified. Grand canonical ensembles have probability distributions of
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(1) |
where is the energy of state r,
is the number of states and
Canonical Ensemble, Chemical Potential, Ensemble

Fowler, R. H. and Guggenheim, E. A. Statistical Thermodynamics: A Version of Statistical Mechanics for Students of Physics and Chemistry.
Cambridge, England: University Press, p. 541, 1949.
© 1996-2007 Eric W. Weisstein
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