state, equation of
Any of a class of equations that relate the pressure P, volume V, and temperature T of a given substance in thermodynamic equilibrium. For example, the equation PV = nRT, where n is the number of moles of gas and R is the universal gas constant, relates the pressure, volume, and temperature of a perfect gas. Real gases, solids, and liquids have more complicated equations of state. See also thermodynamics.
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