van der Waals' law

Modified form of the gas laws that includes corrections for the non-ideal behaviour of real gases (the molecules of ideal gases occupy no space and exert no forces on each other). It is named after Dutch physicist J D van der Waals (1837-1923).

The equation derived from the law states that:

(P + a/V²) (V − b) = RT

where P, V, and T are the pressure, volume, and temperature (in kelvin) of the gas, respectively; R is the gas constant; and a and b are constants for that particular gas.