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equation of state

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ideal gas law
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equation of state, an equation that relates the values of pressure, volume, and temperature of a given substance in thermodynamic equilibrium.

The simplest known example of an equation of state is the one relating the pressure P, the volume V, and the absolute temperature T of one mole of an ideal gas—that is, the ideal gas law PV = RT, in which R is the universal gas constant. Dense real gases, liquids, and solids have more complicated equations of state.

heated air expands
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gas: Equation of state
The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Erik Gregersen.