[en-thal-pee, en-thal-] /ˈɛn θæl pi, ɛnˈθæl-/
noun, plural enthalpies. 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.
a thermodynamic property of a system equal to the sum of its internal energy and the product of its pressure and volume H Also called heat content, total heat
another name for enthalpy
1927, from Greek enthalpein “to warm in,” from en “in” (see en- (2)) + thalpein “to heat.”
enthalpy en·thal·py (ěn’thāl’pē, ěn-thāl’-)
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.
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.
noun, Thermodynamics. 1. the heat required to raise the temperature of a substance one degree. noun 1. the heat required to raise the temperature of a substance by unit temperature interval under specified conditions, usually measured in joules per kelvin. Symbol: Cp (for constant pressure) or Cv (for constant volume) heat capacity n. The amount […]
noun 1. a cramp or muscular spasm caused by loss of water and salt following prolonged exertion in hot weather.
noun, Thermodynamics. 1. See under (def 3). [en-truh-pee] /ˈɛn trə pi/ noun 1. Thermodynamics. 2. (in data transmission and information theory) a measure of the loss of information in a transmitted signal or message. 3. (in cosmology) a hypothetical tendency for the universe to attain a state of maximum homogeneity in which all matter is […]
noun 1. a wavering, shimmering disturbance of air above or around a hot surface.