Relating work, change in internal energy, and heat radiated for dispersion force situations

Statistics – Applications

Scientific paper

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Specific Calculations, Intramolecular Energy Transfer, Intramolecular Dynamics, Dynamics Of Van Der Waals Molecules, Thermodynamics, Thermal Radiation

Scientific paper

This article describes how Casimir-like forces can be calculated for quasistatic situations of macroscopic bodies composed of different materials. The framework of stochastic electrodynamics (SED) is used for much of this discussion in an attempt to provide a very clear physical picture when considering quantities like forces, work done, changes in internal energy, and heat flow. By relating these quantities, one can readily understand why the different methods of calculating dispersion forces agree, such as when obtaining forces via changes in electromagnetic zero-point energy versus computing the average of the Maxwell stress tensor. In addition, a number of physical subtleties involving dispersion forces are discussed, that were certainly not recognized in early work on blackbody radiation, and that still may not be fully appreciated. .

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