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On pressure and ponderomotive force in a dielectric Statistical mechanics of matter in an electromagnetic field II

✍ Scribed by P. Mazur; S.R. de Groot

Publisher: Elsevier Science
Year: 1956
Weight: 577 KB
Volume: 22
Category: Article
ISSN: 0031-8914
DOI: 10.1016/s0031-8914(56)90014-3

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✦ Synopsis

Synopsis

A statistical mechanical derivation of the expressions for both pressure and ponderomotive force in a dielectric is given in terms of averages over microscopic quantities. The existence of microscopic long-range interactions leads to the possibility of defining pressure and ponderomotive force in different ways. A natural way is indicated of dividing the average of the microscopic force into long and short range contributions, which yields the form of the ponderomotive force proposed by Kelvin. It is also shown that, in statistical equilibrium, one may obtain Helmholtz's expression for the ponderomotive force. In the two cases pressure must be defined differently. The relation between these pressures is as predicted by thermodynamic theory.

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