enthalpy(redirected from Enthalpy change)
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n. pl. en·thal·pies
Symbol H 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.
[Greek enthalpein, to heat in (en-, in; see en-2 + thalpein, to heat) + -y.]
(General Physics) 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 or total heat
[C20: from Greek enthalpein to warm in, from en-2 + thalpein to warm]
en•thal•py(ˈɛn θæl pi, ɛnˈθæl-)
n., pl. -pies.
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.
[1925–30; < Greek enthálp(ein) to warm in (en- en-2 + thálpein to warm)]
The amount of energy contained in a system.
A measure of the stored heat energy contained in a substance.
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|Noun||1.||enthalpy - (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure; "enthalpy is the amount of energy in a system capable of doing mechanical work"|
physical property - any property used to characterize matter and energy and their interactions
thermodynamics - the branch of physics concerned with the conversion of different forms of energy