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Enthalpy

//ˈɛn.θəl.piː// noun

Definitions

Noun
  1. 1
    A measure of the heat content of a chemical or physical system. countable, physical, uncountable

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

  2. 2
    (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure wordnet

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".

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