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Homework Help: + instead of - for Maxwell Relation?

  1. Mar 13, 2007 #1
    In the lecture notes

    http://webraft.its.unimelb.edu.au/64...n/lecture3.pdf [Broken]

    on the very last page, should the second realisation relation have -(dU/dp) instead of the + (dU/dp)?
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Mar 13, 2007 #2


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    You need to fix the link. I get a 404 error.
  4. Mar 13, 2007 #3
    Here is the site. Click on lecture 3 go to teh last page

    http://webraft.its.unimelb.edu.au/640322/pub/notes/common.html [Broken]

    I fixed up the error I think it is on this page and have edited my OP accordingly.
    Last edited by a moderator: May 2, 2017
  5. Mar 13, 2007 #4
    I have derived it again and realised that I used the wrong dQ. It should have been dQ=dU-dW whereas I used dQ=dU+dW.
  6. Mar 14, 2007 #5
    First Law applications can be an enormous pain in the ass - some people sometimes define dQ and dW as either done ON the system or done BY the system quite arbitrarily - which of course changes their sign.
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