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Homework Help: Really quick question about entropy

  1. Nov 10, 2007 #1
    My question may be kind of a dumb question, but I tried searching for the explanation online and in my crappy textbook and my lecture notes are kinda unclear.

    Consider 2 systems, A and B, that are brought into contact with each other, with accessible states W_A and W_B, respectively. After contact, the combined system then has (W_A)(W_B). Now, is this true for equilibrium and/or nonequilibrium?

    My guess is that its at nonequilibrium because the net entropy must remain the same or increase, which leads to the 2nd law of thermodynamics
  2. jcsd
  3. Nov 13, 2007 #2
    you actually may try the zeorth law of themodynamics whichstates that if a system a is i themal equilibrium with a system b and system b is in thermal equi. with system c then and c are also in thermal equi.
    i may have ans. your ques. wrong as it is unclesr to me
  4. Nov 13, 2007 #3
    present quesstion in clear way

    in above sentences :rofl:your confused me atAfter contact, the combined system then has (W_A)(W_B). in physics you must represent question in clear way to proper understading OK:smile::smile::smile:
  5. Nov 13, 2007 #4
    Ok, after systems A and B are brought into contact, the total number of microstates in the combined system consisting of systems A and B, is equal to (W_A)*(W_B)
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