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grand potential : ウィキペディア英語版 | grand potential
The grand potential is a quantity used in statistical mechanics, especially for irreversible processes in open systems. The grand potential is the characteristic state function for the grand canonical ensemble. ==Definition==
Grand potential is defined by : where U is the internal energy, ''T'' is the temperature of the system, ''S'' is the entropy, μ is the chemical potential, and ''N'' is the number of particles in the system. The change in the grand potential is given by : where ''P'' is pressure and ''V'' is volume, using the fundamental thermodynamic relation (combined first and second thermodynamic laws); : When the system is in thermodynamic equilibrium, Φ''G'' is a minimum. This can be seen by considering that dΦ''G'' is zero if the volume is fixed and the temperature and chemical potential have stopped evolving.
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