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Helmholtz free energy

  1. Mar 12, 2012 #1
    I'm having some trouble understanding this concept. Why is it that you sometimes can get heat for free from the environment? Like suppose you have a system, on which you make an energyconsuming proces which creates entropy. Then you subtract TΔS because apparantly heat can enter when the entropy increases - why is that? Does the temperature drop, when we increase the entropy?
    Can you guys please explain in terms of microstates too, as it is that way I feel I understand it the best.
    Also, how do you know that the temperatures between the environment and the system is the same AFTER it has absorbed exactly TΔS?
     
  2. jcsd
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