enthalpy
[ en-thal-pee, en-thal- ]
/ ˈɛn θæl pi, ɛnˈθæl- /
noun, plural en·thal·pies. Thermodynamics.
a quantity associated with a thermodynamic system, expressed as the internal energy of a system plus the product of the pressure and volume of the system, having the property that during an isobaric process, the change in the quantity is equal to the heat transferred during the process. Symbol: H
Also called
heat content,
total heat.
Words nearby enthalpy
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entertainer,
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enthalpy,
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enthesitis,
enthesopathy,
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enthral
British Dictionary definitions for enthalpy
enthalpy
/ (ˈɛnθəlpɪ, ɛnˈθæl-) /
noun
a thermodynamic property of a system equal to the sum of its internal energy and the product of its pressure and volume
Symbol: H Also called: heat content, total heat
Word Origin for enthalpy
C20: from Greek
enthalpein to warm in, from
en- ² +
thalpein to warm
Medical definitions for enthalpy
enthalpy
[ ĕn′thăl′pē, ĕn-thăl′- ]
n.
A thermodynamic function of a system, equivalent to the sum of the internal energy of the system plus the product of its volume multiplied by the pressure exerted on it by its surroundings.
Scientific definitions for enthalpy
enthalpy
[ ĕn′thăl′pē ]
A partial measure of the internal energy of a system. Enthalpy cannot be directly measured, but changes in it can be. If an outside pressure on a system is held constant, a change in enthalpy entails a change in the system's internal energy, plus a change in the system's volume (meaning the system exchanges energy with the outside world). For example, in endothermic chemical reactions, the change in enthalpy is the amount of energy absorbed by the reaction; in exothermic reactions, it is the amount given off. See also thermodynamics.