1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Thermal physics. Entropy's functional dependecy

  1. Apr 7, 2012 #1
    1. The problem statement, all variables and given/known data
    I'm reading Kittel&kroemer's Thermal physics. How can I know Entropy's functional dependency?
    Author assume entropy's functional dependecy without explanations and derive some equaltities. So I can't follow it.

    N the number of particles. U Energy of the system. V. volume of the system [itex]\tau[/itex] fundamental temperature
    [itex]\sigma(N,U)[/itex], [itex]\sigma(\tau,V) etc...[/itex]

    2. Relevant equations

    3. The attempt at a solution
    Last edited: Apr 7, 2012
  2. jcsd
  3. Apr 7, 2012 #2

    George Jones

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    On what page(s) does this occur?
  4. Apr 7, 2012 #3
    2nd edition p66~p67, p43. "" is what author says.
    p66 "The number of states and thus the entropy depend only on U and on V, for fixed number of particles," I don't know why the number of states depend on on U and V.
    In chapter2 multiplicity thus entropy is function of U and N. p43 "The entropy may depend on additional independent variables" I don't know in what circumstance the entropy depend on what variables.
    p67 "If we denote these interdependent values of dU and dV by [itex](\delta U)_{\sigma}[/itex] and [itex](\delta V)_{\sigma}[/itex], the entropy change will be zero." I don't know why it's possible to assume constant entropy and make U and V be interdependent.
    Last edited: Apr 7, 2012
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Thermal physics. Entropy's functional dependecy
  1. Thermal Physics (Replies: 3)