Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

What is fugacity?

  1. Apr 25, 2014 #1
    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...
     
  2. jcsd
  3. Apr 25, 2014 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    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.
     
  4. Apr 26, 2014 #3
    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
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: What is fugacity?
  1. What if (Replies: 4)

  2. What is torque? (Replies: 4)

  3. What is Gravity? (Replies: 11)

Loading...