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Exergy and Gibbs free energy

  1. May 31, 2014 #1
    Hi. I have two questions:

    1) Is -ΔG the amount of useful work a system can do while the pressure and temperature of the surroundings are constant?

    2) Is exergy = -ΔG only if the pressure and temperature of the system and surroundings is constant?

  2. jcsd
  3. May 31, 2014 #2
    What is exergy?
  4. May 31, 2014 #3
    It's defined as the theoretical maximum work a system can do when moving towards thermal equilibrium.

    I'm just unsure about the specifics behind its definition.

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