**FUGACITY**

The FUGACITY function returns the fugacity of the specified pure fluid for the given conditions. Fugacity is defined by the following relation:

where

f is fugacity (same units as pressure)

P is pressure

v is the specific volume of the fluid

T is the absolute temperature

R is the gas constant.

For an ideal gas fluid, f is identical to P.

The FUGACITY function will accept any appropriate set of inputs. Fugacity is particularly useful for some types of phase equilibrium calculations.

Example:

f=FUGACITY (R$,T=100,P=101.3)

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