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I Work done by a van der waal gas/real gas in a expansion

  1. Jul 12, 2016 #1
    Edited: To summarize the below attached jpg file is the formula for work done by a van der waals gas in a isothermal reversible expansion.

    Is there a way to find the work done by a van der waal gas in a isothermal irreversible expansion? i.e the real gas expands against a constant pressure (in a balloon)
  2. jcsd
  3. Jul 12, 2016 #2
    Sure. But you may not be able to get an analytic expression. You drop the pressure from pi to pf at time zero, and then you hold the pressure at pf until the system equilibrates at the new state. It this the process you are envisioning?
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