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# total heat

noun, Thermodynamics.
1.

## enthalpy

[en-thal-pee, en-thal-] /ˈɛn θæl pi, ɛnˈθæl-/
noun, plural enthalpies. Thermodynamics.
1.
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.
Origin of enthalpy
1925-1930
1925-30; < Greek enthálp(ein) to warm in (en- en-2 + thálpein to warm) + -y3
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for total heat
Historical Examples
• The sum of the two quantities is called the total heat of the steam at 100°.

• The second is the actual heat efficiency, or the ratio of the heat turned into work to the total heat received by the engine.

Victor Wilfred Pag
• The total expenditure of heat of a man at rest must be equal to the total heat of combustion.

Ernst Mach
• The quantity actually observed by Rowland was the total heat.

• From this it is clear that the larger proportion of total heat of the body is supplied by the muscles.

• Fully four-fifths of the total heat are used up in this molecular work, only one-fifth remaining to warm the battery.

John Tyndall
• The total heat developed by an ounce of zinc through its union with oxygen in the battery is also absolutely invariable.

John Tyndall
• Minimum thermal conductance occurs when total heat transfer through these layers is reduced to its lowest possible rate.

• The total heat of the steam remains nearly constant, whatever be the temperature at which the vaporization occurred.

• The thermal efficiency of an engine is the ratio of the heat transformed into work to the total heat supplied to the engine.

Anonymous
British Dictionary definitions for total heat

## total heat

noun
1.
another term for enthalpy

## enthalpy

/ˈɛnθəlpɪ; ɛnˈθæl-/
noun
1.
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
Word Origin
C20: from Greek enthalpein to warm in, from en-² + thalpein to warm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for total heat

## enthalpy

n.

1927, from Greek enthalpein "to warm in," from en "in" (see en- (2)) + thalpein "to heat."

Online Etymology Dictionary, © 2010 Douglas Harper
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total heat in Medicine

enthalpy en·thal·py (ěn'thāl'pē, ěn-thāl'-)
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.

The American Heritage® Stedman's Medical Dictionary
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total heat in Science
 enthalpy   (ěn'thāl'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.
The American Heritage® Science Dictionary
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