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enthalpy H i the sum of the internal energy U and the 'pV-energy'= p*V.
The pV term is also called flow-energy, pressure-energy or energy of displacement. The p is the external pressure, but for systems at constant pressure it is also equal to the internal pressure. Hence: H=U+pV.
It follows that H is a composite form of energy, a statement not commonly found in the literature.
>> 'Energy-balance of the Joule-Thomson experiment: Enthalpy change at decompression.' (NPT-procestechnologie, 2010, 17(4)18-22)
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