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In terms, enthalpy (TR:246) (LH:12) (TL:258|#137), from the Greek enthalphen (ενθαλπιν), meaning "to warm"[1], or εν (en) meaning "in" + θαλπος (thalpos) meaning "to heat", is the name of the following function:

which is the the sum of the internal energy U and the product of the pressure P and the volume V of a body, respectively, combined being conceptualized as the "heat content" of a body. The term was coined by Heike Onnes (1909) during the first meeting of the Institute of Refrigeration, Paris.[2]

End matter


  1. Battino, Rubin; Wood, Scott E.; Strong, Laurence E. (1997). “A Brief History of Thermodynamics Notation” (abs) (pdf), Journal of Chemical Education, 74(3):304-05.
  2. Laidler, Keith J. (1993). The World of Physical Chemistry (pg. 110). Oxford University Press.

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