enthalpy vs. internal energy

enthalpy

[en-thal-pee, en-thal-] / ˈɛn θæl pi, ɛnˈθæl- /

noun

Thermodynamics.

a quantity associated with a thermodynamic system, expressed as the internal energy of a system plus the product of the pressure and volume of the system, having the property that during an isobaric process, the change in the quantity is equal to the heat transferred during the process. H

internal energy

Thermodynamics.

a function of thermodynamic variables, as temperature, that represents the internal state of a system that is due to the energies of the molecular constituents of the system. The change in internal energy during a process is equal to the net heat entering the system minus the net work done by the system. U