van der Waals' law

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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.

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