View your list of saved words. (You can log in using Facebook.)
About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.
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
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
Sum of the internal energy E and the product of the pressureP and volume V of a thermodynamic system (seethermodynamics). 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 (seeconservation 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.