enthalpy

== English == === 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". === Pronunciation === IPA(key): /ˈɛn.θəl.piː/ === Noun === enthalpy (countable and uncountable, plural enthalpies) (thermodynamics, physical chemistry) A measure of the heat content of a chemical or physical system. H = U + p V {\displaystyle H=U+pV} , where H is enthalpy, U is internal energy, p is pressure, and V is volume. ==== Derived terms ==== ==== Translations ==== === See also === Gibbs free energy