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
Vm = Molar volume
R = Molar gas constant
T = Temperature
a, b = van der Waal's constants
Tc = Critical temperature
pc = Critical pressure
Vmc = Critical molar volume
pr = p/pc
Vr = Vm/Vmc
Tr = T/Tc

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

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

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