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What are the systems that I am comparing in this entropy problem

  1. Mar 1, 2012 #1
    I'm having trouble with understanding entropy, I'd just like a push in the right direction conceptually.

    relevant equations: delta S = S2 - S1 = Q/T = integral (dQ/T)

    If I have two bodies that when brought into contact obtain thermal equilibrium, is the change in entropy that I am measuring the following? (Or in other words, what are the systems that I am comparing?)

    isolated body1 and body2 = initial system/entropy
    combined body = final system/entropy

    I think that's right, but doesn't each body have its own initial value for entropy? I'm not really sure how to go about this.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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