Fugacity of A Pure Liquid
For a pure fluid in vapor-liquid equilibrium, the vapor phase fugacity is equal to the liquid phase fugacity. At pressures above the saturation pressure, liquid phase fugacity is:
The exponential term represents the Poynting correction factor and is usually near 1.0 unless pressures are very high. Frequently, the fugacity of the pure liquid is used as a reference state when using activity coefficients.
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