Question

what is fugacity? How it different from pressure?​

Answer 1

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Fugacity is a measure of the "real" partial pressure or pressure of a gas in comparison to ideal gas. It is the effective partial pressure or pressure - a measure of thermodynamic activity. Fugacity is also a measure of chemical potential. Practically, fugacity is a measure of Gibbs molar internal energy

Answer 2

Answer:

In chemical thermodynamics, the fugacity of a real gas is an effective partial pressure which replaces the mechanical partial pressure in an accurate computation of the chemical equilibrium constant. It is equal to the pressure of an ideal gas which has the same temperature and molar Gibbs free energy as the real gas. 

For gases at low pressures (where the ideal gas law is a good approximation),fugacity is roughly equal to pressure. Thus, for an ideal gas, the ratio ϕ = f/P between fugacity f and pressure P (thefugacity coefficient) is equal to 1.

Explanation:

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