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I Why can U be expanded in terms of T and V?

  1. Mar 24, 2016 #1
    when expressing dS as a function of dV and dT, dU was expanded out as you can see in the screenshot below, is there a mathematical rule which allows this??? does the fact that the internal energy is expanded out change the meaning of the expression? Screen Shot 2016-03-24 at 17.45.17.png
  2. jcsd
  3. Mar 24, 2016 #2
    How many intensive properties are required to specify the state of a single phase material of constant composition?
  4. Mar 25, 2016 #3
    dU/dT(V)+dU/dV(T) is the differential of U with the coordinated (T,V)
  5. Mar 27, 2016 #4
    Thank you!
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