What is (Subject: Thermodynamics)

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dcs23
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What is the interpretation of enthalpy in an isothermic system?

I ask as I am trying to understand what [tex]\int p d\left(\frac{1}{\rho}\right)[/tex] means in the context of a Lagrangian fluid.
 
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Enthalpy is the total energy in the system, plus the work required to move the surrounding environment out of the way: H=U+PV.
 

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