Fugacity: Definition & Intuitive Sense

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Fugacity is a corrected pressure that provides a more intuitive understanding of non-ideal gas behavior, essentially acting as a substitute for pressure in real gas equations. It allows the conversion of ideal gas equations into forms applicable to real gases, facilitating calculations involving Gibbs free energy. The relationship VdP = RT d ln P for ideal gases is adapted to VdP = RT d ln f for real gases, where f represents fugacity. Using fugacity simplifies the analysis of thermodynamic properties in non-ideal conditions. Understanding fugacity is crucial for accurately modeling gas behavior in various scientific and engineering applications.
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What is fugacity ? I know it the corrected pressure for non ideal systems , but I need a much more intuitive sense of the term. It would be nice to get some help on this...
 
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The intuitive sense for it is "pressure" - a pressing in against a surface.
It's basically a way to convert ideal gas equations into equations more useful for real gasses.
 
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alighazanfer25 said:
What is fugacity ? I know it the corrected pressure for non ideal systems , but I need a much more intuitive sense of the term. It would be nice to get some help on this...

For an ideal gas, VdP = RT d lnP

For a real gas, we use an equation of the same form to express VdP:

VdP = RT d ln f

where f is the fugacity. This is used to determine the change in Gibbs free energy dG = VdP at constant temperature. So dG = RT d ln f. In practice, it is easier to work in terms of the fugacity than the pressure when working in the non-ideal gas region.

Chet
 

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