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This states that as the pressure of a real gas approaches zero, the Fugacity of each component in the mixture approaches its Partial Pressure.

This is often reinterpreted as meaning that as pressure approaches zero, a real gas becomes 'perfect'. Care must be taken when making this sort of reinterpretation since not all properties of real gases approach their 'perfect' values at zero pressure. The Joule-Thomson Coefficient is a notable example of this. It remains nonzero at P = 0, whereas the perfect gas value is identically zero. (See also Perfect Gas.)

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