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Wikipedia definition
1. Virial expansionThe classical virial expansion expresses the pressure of a many-particle system in equilibrium as a power series in the density. The virial expansion was introduced in 1901 by Heike Kamerlingh Onnes as a generalization of the ideal gas law. He wrote for a gas containing atoms or molecules, where is the pressure, is the Boltzmann constant, is the absolute temperature, and is the number density of the gas.
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