enthalpy


en·thal·py

noun \ˈen-ˌthal-pē, en-ˈ\

Definition of ENTHALPY

:  the sum of the internal energy of a body or system and the product of its volume multiplied by the pressure

Origin of ENTHALPY

en- + Greek thalpein to heat
First Known Use: circa 1924

en·thal·py

noun \ˈen-ˌthal-pē, en-ˈ\   (Medical Dictionary)
plural en·thal·pies

Medical Definition of ENTHALPY

: the sum of the internal energy of a body and the product of its volume multiplied by the pressure

enthalpy

noun    (Concise Encyclopedia)

Sum of the internal energy E and the product of the pressure P and volume V of a thermodynamic system (see thermodynamics). So, enthalpy H = E + PV. Its value is determined by the temperature, pressure, and composition of the system at any given time. According to the law of conservation of energy (see conservation law), the change in internal energy is equal to the heat transferred to the system minus the work done by the system. If the only work done is a change of volume at constant pressure, the enthalpy change is exactly equal to the heat transferred to the system.

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