What is the Meaning of "U" in One-Dimensional Gas?

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Karlisbad
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Meaning of "U"

If we have a One dimensional gas, so using [tex]\beta = \frac{1}{KT}[/tex]

then we can define (if we knew partition function) the quantity U so:

[tex]U= - \frac{\partial LnZ}{\partial \beta}[/tex]

which is called "inner energy" if we call the potential of the particles V(x) my question is if somehow U (inner energy) is the derivative of a potential or something similar
 
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U is the internal energy of the system. Why would it be the derivative of a potential (which, by the way, is usually a force or force field)?