It's symbolized by an H

• Thermodynamic quantity
• Total heat of a thermodynamic system
• The sum of the internal energy of a system and the product of its volume and pressure

Wiktionary Word definitions in Wiktionary
n. (context physics chemistry English) In thermodynamics, a measure of the heat content of a chemical or physical system.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1927 in physics, from Greek enthalpein "to warm in," from en "in" (see en- (2)) + thalpein "to heat," from thalpos "warmth, heat," especially "summer heat."

Wikipedia Word definitions in Wikipedia
Enthalpy (Symbol: H ) is a measurement of energy in a thermodynamic system . It is the thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume. More ...

WordNet Word definitions in WordNet
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" [syn: heat content , total heat , H ]