n. (Thermodynamics)A thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure; “enthalpy is the amount of energy in a system capable of doing mechanical work”). [ WordNet 2.1 ]
(n) (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure, Syn. enthalpy, H, total heat, Example:enthalpy is the amount of energy in a system capable of doing mechanical work