Science / Chemistry / Van Der Waals Equation: A semiempirical equation that describes the relationship between pressure (P), volume (V), temperature (T), and moles of gas (n) for a real gas. The equation is (P + n2a/V2)(V - nb) = nrt, where a and b are constants that include the effects of molecular attractions and molecular volume. A and b are usually fitted to experimental data for a particular gas.
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