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Fugacity

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material:
Pls, I need the explanation of the physical property,called fugacity.

Donaldson Tan:
think fugacity as a pseudo pressure.

isothermal change for a perfect gas: dg = v dp = RT (dp/p)

the Gibbs free energy of a real gas is therefore: dg = v dp = RT (df/f) where f is fugacity

notice that p is replaced with f in the real gas function.

fugacity is a measure of deviation of real gas from the ideal gas model.

Mitch:
Basically, its how much the data needs to be "fudged" in order replicate theory.

ppithermo:
 ;D
Fugacity has the dimension of a pressure.

the ratio of the fugacity  to the pressure is the fugacity coefficient.

It gives a measure of "how much" a gas deviates from an ideal gas.

For an ideal gas, fugacity and pressure are identical

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