Fugacity

In thermodynamics, the fugacity is a state function of any isothermal system. The fugacity, which has units of pressure, represents the tendency of a fluid to e…

In thermodynamics, the fugacity is a state function of any isothermal system. The fugacity, which has units of pressure, represents the tendency of a fluid to escape or expand isothermally. For gases at low pressures where the ideal gas law holds, fugacity is equal to pressure. The ratio $ϕ = f / P$ between fugacity $f$ and pressure $P$ is called the fugacity coefficient; therefore, $ϕ = 1$ for an ideal gas.

The fugacity $f$ is defined at fixed temperature $T$ by the following differential relation:

d \ln f = \frac{d G}{R T} = \frac{V d P}{R T}

where $G$ is the Gibbs free energy, $R$ is the molar gas constant, and $V$ is the fluid's volume. For any two isothermal physical states, represented by subscripts 1 and 2, the ratio of the two fugacities is as follows:

f_{2} / f_{1} = e x p (\frac{1}{R T} \int_{G_{1}}^{G_{2}} d G) = e x p (\frac{1}{R T} \int_{P_{1}}^{P_{2}} V d P)

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Fugacity

Senin, 2013-12-09 12:26:12

In thermodynamics, the fugacity is a state function of any isothermal system. The fugacity, which has units of pressure, represents the tendency of a...

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Fugacity

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