enthalpyn.

Brit.

/ˈɛnθalpi/,

/ˈɛnθəlpi/,

/ɛnˈθalpi/,

/ᵻnˈθalpi/, U.S.

/ˈɛnˌθælpi/,

/ᵻnˈθælpi/,

/ɛnˈθælpi/

Origin: A borrowing from Dutch. Etymon: Dutch enthalpie.

Etymology: < Dutch enthalpie (1909 or earlier; attributed to H. Kamerlingh Onnes) < Hellenistic Greek ἐνθάλπειν to warm in ( < ancient Greek ἐν- en- prefix² + θάλπειν to heat, of uncertain origin; perhaps < the same base as θαλυκρός warm, glowing) + Dutch -ie -y suffix³.Compare German Enthalpie (1910 or earlier).

Physics and Chemistry.

1. The quantity obtained by adding the internal energy of a thermodynamic system to the product of its volume and the pressure exerted on it.Enthalpy is frequently used to express changes in the energy of a system at constant pressure. In such a system, changes in enthalpy are equal to the amount of energy absorbed or given off by the system.

ΘΚΠ

the world > matter > chemistry > physical chemistry > thermochemistry > [noun] > enthalpy

enthalpy1909

the world > matter > physics > mechanics > dynamics > thermodynamics > [noun] > specific properties

spin-heat1851

total heat1851

work function1878

enthalpy1909

1909 Proc. Section Sci. Koninklijke Akad. van Wetenschappen te Amsterdam 11 864 Preliminary experiments..led to a special investigation of the thermodynamics of expansion through a valve and how a valve apparatus has to be arranged so that the enthalpy before and after expansion remains the same.

1930 Engineering 8 Aug. 162/1 The calculation of the enthalpy..will show that most of the heat present..is the latent heat in the associated steam.

1967 E. U. Condon & H. Odishaw Handbk. Physics (ed. 2) v. i. 5 In a change occurring at constant pressure..all the heat added to the system goes to increase the enthalpy.

2010 P. Atkins Laws of Thermodynamics: Very Short Introd. ii. 31 In formal thermodynamics the difference between changes in internal energy and enthalpy must always be borne in mind.

2. The change in enthalpy associated with a specified process.Frequently (especially in early use) with of, as enthalpy of atomization, enthalpy of vaporization, etc. In later use frequently also with modifying noun.

ΚΠ

1932 Naval Engineers Jrnl Aug. 366 Callendar places it at a considerably higher pressure and temperature and finds an enthalpy of vaporization of 116 Btu.

1962 Jrnl. Physical Chem. 66 1780/1 The unfavorable enthalpy of formation is more than counterbalanced by the positive entropy.

1987 Jrnl. Nucl. Materials 148 62/2 Under such conditions, the dissolution enthalpy is independent of the concentration of the solute.

2002 J. Barrett Atomic Struct. & Periodicity vi. 127 The standard enthalpy of atomization is a good measure of the stability of an element in the form it exists under standard conditions.

This entry has been updated (OED Third Edition, September 2018; most recently modified version published online March 2022).

单词	enthalpy
释义	enthalpyn. Brit. /ˈɛnθalpi/, /ˈɛnθəlpi/, /ɛnˈθalpi/, /ᵻnˈθalpi/, U.S. /ˈɛnˌθælpi/, /ᵻnˈθælpi/, /ɛnˈθælpi/ Origin: A borrowing from Dutch. Etymon: Dutch enthalpie. Etymology: < Dutch enthalpie (1909 or earlier; attributed to H. Kamerlingh Onnes) < Hellenistic Greek ἐνθάλπειν to warm in ( < ancient Greek ἐν- en- prefix² + θάλπειν to heat, of uncertain origin; perhaps < the same base as θαλυκρός warm, glowing) + Dutch -ie -y suffix³.Compare German Enthalpie (1910 or earlier). Physics and Chemistry. 1. The quantity obtained by adding the internal energy of a thermodynamic system to the product of its volume and the pressure exerted on it.Enthalpy is frequently used to express changes in the energy of a system at constant pressure. In such a system, changes in enthalpy are equal to the amount of energy absorbed or given off by the system. ΘΚΠ the world > matter > chemistry > physical chemistry > thermochemistry > [noun] > enthalpy enthalpy1909 the world > matter > physics > mechanics > dynamics > thermodynamics > [noun] > specific properties spin-heat1851 total heat1851 work function1878 enthalpy1909 1909 Proc. Section Sci. Koninklijke Akad. van Wetenschappen te Amsterdam 11 864 Preliminary experiments..led to a special investigation of the thermodynamics of expansion through a valve and how a valve apparatus has to be arranged so that the enthalpy before and after expansion remains the same. 1930 Engineering 8 Aug. 162/1 The calculation of the enthalpy..will show that most of the heat present..is the latent heat in the associated steam. 1967 E. U. Condon & H. Odishaw Handbk. Physics (ed. 2) v. i. 5 In a change occurring at constant pressure..all the heat added to the system goes to increase the enthalpy. 2010 P. Atkins Laws of Thermodynamics: Very Short Introd. ii. 31 In formal thermodynamics the difference between changes in internal energy and enthalpy must always be borne in mind. 2. The change in enthalpy associated with a specified process.Frequently (especially in early use) with of, as enthalpy of atomization, enthalpy of vaporization, etc. In later use frequently also with modifying noun. ΚΠ 1932 Naval Engineers Jrnl Aug. 366 Callendar places it at a considerably higher pressure and temperature and finds an enthalpy of vaporization of 116 Btu. 1962 Jrnl. Physical Chem. 66 1780/1 The unfavorable enthalpy of formation is more than counterbalanced by the positive entropy. 1987 Jrnl. Nucl. Materials 148 62/2 Under such conditions, the dissolution enthalpy is independent of the concentration of the solute. 2002 J. Barrett Atomic Struct. & Periodicity vi. 127 The standard enthalpy of atomization is a good measure of the stability of an element in the form it exists under standard conditions. This entry has been updated (OED Third Edition, September 2018; most recently modified version published online March 2022). < n.1909
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