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Energy is the conserved quantity associated to time-translation invariance and represents the work a system is capable of doing. Use this tag for questions about energy, and consider adding [tag:energy-conservation] if it is specifically about its conservation.

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contact with a heat reservoir of temperature, $T_{res}$. A diagram of the setup is shown below: I believe that solving it involves the minimisation of the system's free energy $F$: $$F = U - TS … equation ( $f(x_{1}) = kx_{1} - pA$), which then leads to the equation $kx_{eq}(L - x_{eq}) = nRT$. This seems to suggest that the total internal energy of the system can be split into the energy of …
asked Oct 22 '16 by Stev1234