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What is the statistical weight factor (in Pathria)?

  1. Oct 14, 2012 #1
    Hello Everybody,

    I am working with Pathria to learn statistical mechanics, and in page 141 a quantity already defined in 129 makes a reappearance; it is the statistical weight factor. My question is, what is it? What does it mean?

    To be more precise, what does the following equation in page 141 mean?
    [tex] Q_N (V,T) = \sum'_{ \left \{ n_\varepsilon \right \}} g \left \{ n_\varepsilon \right \} e^{- \beta \sum_{\varepsilon } n_\varepsilon \varepsilon }; [/tex]
    where Q_N is the canonical partition function, g is the statistical weight factor and the summation is performed over all possible sets.

    Any help would be greatly appreciated.
  2. jcsd
  3. Nov 13, 2015 #2
    in that case its basically the degeneracy of the level.
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