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van der Waals Equation

An equation for non-ideal gasses that accounts for intermolecular attraction and the volumes occupied by the gas molecules.

Equation of state:
Critical point:


Reduced equation of state:
where: p = Pressure; V_m = Molar volume; R = Molar gas constant; T = Temperature; a, b = van der Waal's constants; T_c = Critical temperature; p_c = Critical pressure; V_mc = Critical molar volume; p_r = p/p_c; V_r = V_m/V_mc; T_r = T/T_c

a and b are usually found experimentally for a particular gas.

See also: Lennard-Jones Potential, van der Waals Force, van der Waals Radius.