enthalpy

Definition

A measure of the heat content of a chemical or physical system.

Etymology

From Ancient Greek ἐν- (en-, “in”) + θάλπω (thálpō, “to warm”). Coined by Dutch physicist Heike Kamerlingh Onnes, but first used in print by J. P. Dalton in 1909 in a paper titled "Researches on the Joule-Kelvin-effect, especially at low temperatures".

Example Sentences

• "H=U+pV, where H is enthalpy, U is internal energy, p is pressure, and V is volume."