isobaricadj.n.

/ʌɪsəʊˈbarɪk/

Etymology: < isobar n. + -ic suffix. (Not formed on Greek analogies.)

A. adj.

a. Indicating equal barometric pressure; containing or relating to isobars.

ΘΚΠ

the world > the earth > weather and the atmosphere > weather > study or science of weather > diagrams, graphs, or lines > [adjective] > barometric pressure

isobarometric1864

isobaric1877

isallobaric1911

1877 T. H. Huxley Physiography vi. 95 Much may be learnt about winds by studying the isobaric lines.

1882 Standard 26 Dec. 7/4 The daily isobaric charts will receive greatly increased attention.

1883 A. Buchan in Encycl. Brit. XVI. 139 Isobaric maps may be considered as furnishing the key to the more important questions of meteorological inquiry.

b. Occurring at or pertaining to a constant pressure.

ΘΚΠ

the world > matter > gas > air > [adjective] > under pressure > relating to constant pressure

isopiestic1873

isobaric1903

1903 A. Ogg tr. Planck Treat. Thermodynamics i. i. 7 (heading) Behaviour under constant pressure (isopiestic or isobaric changes).

1933 D. J. Martin Introd. Thermodynamics for Chemists xiii. 315 The isobaric heat of adsorption corresponds to the heat of a reaction in a condensed system, the amount adsorbed changes while the pressure remains practically constant.

1937 P. S. Epstein Textbk. Thermodynamics iii. 46 The heat function acquires a particular importance in the so-called isobaric process, i.e. a process which takes place without change of pressure.

1966 R. Joel Basic Engin. Thermodynamics i. 80 The pressure remains constant throughout the process. It is often referred to as an isobaric or isopiestic process.

2. Physics. Of, pertaining to, or being isobars (sense 2); isobaric spin = isospin n. Const. with.

ΘΚΠ

the world > matter > chemistry > elements and compounds > [adjective] > of or relating to elements > properties > isobaric

isobaric1919

the world > matter > physics > atomic physics > particle physics > [noun] > vector quantity

isobaric spin1953

isospin1956

1919 Nature 18 Sept. 61/2 Elements can be regarded as divisible into three classes:—(1) Isotopic elements, each set of which have different atomic weights but identical chemical properties; (2) isobaric elements which have identical atomic weights but different chemical properties; and (3) normal elements which differ..both in atomic weights and chemical properties.

1919 F. Soddy in Trans. Chem. Soc. 115 23 We have to take into account in our analysis of matter, not only the heterobaric heterotopes before recognised, but also heterobaric and isobaric isotopes and isobaric heterotopes or isobares.

1933 F. W. Aston Mass-spectra & Isotopes xii. 158 Spectra were obtained which showed four strong isotopes and two very weak ones, one of which is isobaric with W¹⁸⁶.

1948 S. Glasstone Textbk. Physical Chem. (ed. 2) ii. 171 With the development of the study of artificial radioactivity it has become apparent that there are more than seventy pairs of such isobaric isotopes, now known as isomeric nuclei.

1953 D. R. Inglis in Rev. Mod. Physics XXV. 395/2 One finds the states listed according to the usual quantum numbers L and S of the (LS)-coupling scheme and also according to the isobaric spin quantum number T (or isotopic spin as it has been less aptly called since it was named long ago by Wigner, who agrees to this renaming of his child).

1971 Physics Bull. Mar. 137/1 Isobaric spin was first introduced into nuclear interactions by Heisenberg purely as a mathematical convenience.

3. Medicine. Of, pertaining to, or designating a solution for spinal anæsthesia having the same density as the cerebro-spinal fluid.

ΘΚΠ

the world > health and disease > healing > medicines or physic > medicines for specific purpose > anaesthetic > [adjective] > types of

hyperbaric1930

hypobaric1930

isobaric1930

1930 W. H. Jones in Brit. Jrnl. Anæsthesia VII. 110 I shall use the terms hyper-, iso- and hypo-baric, to describe solutions which have specific gravities greater than, equal to, or less than that of the cerebro-spinal fluid.

1946 J. L. Southworth et al. Pitkin's Conduction Anesthesia xvii. 761/2 The anesthetist should know in advance whether the anesthetic solution is hypobaric, hyperbaric, or isobaric, so that the posture of the patient can be regulated accordingly.

1947 J. Adriani Techniques & Procedures Anesthesia v. 222 A 2 ½% solution of procaine in distilled water is nearly isobaric.

1962 J. Adriani Chem. & Physics Anaesthesia (ed. 2) xxxi. 653/1 The results obtained with isobaric techniques are unpredictable and variable.

1971 P. C. Lund Princ. & Pract. Spinal Anesthesia vii. 371 Isobaric solutions have not been popular..because of the difficulty of achieving predictable levels of anesthesia.

1971 P. C. Lund Princ. & Pract. Spinal Anesthesia vii. 371 An adaptation of isobaric spinal anesthesia for anorectal surgery was introduced by Jacoby et al. in 1965.

B. n.

= isobar n. 1b.

ΘΚΠ

the world > matter > gas > air > [noun] > air-pressure > line in diagram indicating equal

isopiestic1873

isobar1892

isobaric1903

1903 Engineer 24 July 83/3 The isobarics of evaporation happen to be isothermals.

1937 M. W. Zemansky Heat & Thermodynamics iv. 56 The series of short isobarics and isovolumics from i to f and the continuous curve from i to f represent other possibilities.

This entry has not yet been fully updated (first published 1900; most recently modified version published online March 2021).

单词	isobaric
释义	isobaricadj.n. /ʌɪsəʊˈbarɪk/ Etymology: < isobar n. + -ic suffix. (Not formed on Greek analogies.) A. adj. 1. a. Indicating equal barometric pressure; containing or relating to isobars. ΘΚΠ the world > the earth > weather and the atmosphere > weather > study or science of weather > diagrams, graphs, or lines > [adjective] > barometric pressure isobarometric1864 isobaric1877 isallobaric1911 1877 T. H. Huxley Physiography vi. 95 Much may be learnt about winds by studying the isobaric lines. 1882 Standard 26 Dec. 7/4 The daily isobaric charts will receive greatly increased attention. 1883 A. Buchan in Encycl. Brit. XVI. 139 Isobaric maps may be considered as furnishing the key to the more important questions of meteorological inquiry. b. Occurring at or pertaining to a constant pressure. ΘΚΠ the world > matter > gas > air > [adjective] > under pressure > relating to constant pressure isopiestic1873 isobaric1903 1903 A. Ogg tr. Planck Treat. Thermodynamics i. i. 7 (heading) Behaviour under constant pressure (isopiestic or isobaric changes). 1933 D. J. Martin Introd. Thermodynamics for Chemists xiii. 315 The isobaric heat of adsorption corresponds to the heat of a reaction in a condensed system, the amount adsorbed changes while the pressure remains practically constant. 1937 P. S. Epstein Textbk. Thermodynamics iii. 46 The heat function acquires a particular importance in the so-called isobaric process, i.e. a process which takes place without change of pressure. 1966 R. Joel Basic Engin. Thermodynamics i. 80 The pressure remains constant throughout the process. It is often referred to as an isobaric or isopiestic process. 2. Physics. Of, pertaining to, or being isobars (sense 2); isobaric spin = isospin n. Const. with. ΘΚΠ the world > matter > chemistry > elements and compounds > [adjective] > of or relating to elements > properties > isobaric isobaric1919 the world > matter > physics > atomic physics > particle physics > [noun] > vector quantity isobaric spin1953 isospin1956 1919 Nature 18 Sept. 61/2 Elements can be regarded as divisible into three classes:—(1) Isotopic elements, each set of which have different atomic weights but identical chemical properties; (2) isobaric elements which have identical atomic weights but different chemical properties; and (3) normal elements which differ..both in atomic weights and chemical properties. 1919 F. Soddy in Trans. Chem. Soc. 115 23 We have to take into account in our analysis of matter, not only the heterobaric heterotopes before recognised, but also heterobaric and isobaric isotopes and isobaric heterotopes or isobares. 1933 F. W. Aston Mass-spectra & Isotopes xii. 158 Spectra were obtained which showed four strong isotopes and two very weak ones, one of which is isobaric with W¹⁸⁶. 1948 S. Glasstone Textbk. Physical Chem. (ed. 2) ii. 171 With the development of the study of artificial radioactivity it has become apparent that there are more than seventy pairs of such isobaric isotopes, now known as isomeric nuclei. 1953 D. R. Inglis in Rev. Mod. Physics XXV. 395/2 One finds the states listed according to the usual quantum numbers L and S of the (LS)-coupling scheme and also according to the isobaric spin quantum number T (or isotopic spin as it has been less aptly called since it was named long ago by Wigner, who agrees to this renaming of his child). 1971 Physics Bull. Mar. 137/1 Isobaric spin was first introduced into nuclear interactions by Heisenberg purely as a mathematical convenience. 3. Medicine. Of, pertaining to, or designating a solution for spinal anæsthesia having the same density as the cerebro-spinal fluid. ΘΚΠ the world > health and disease > healing > medicines or physic > medicines for specific purpose > anaesthetic > [adjective] > types of hyperbaric1930 hypobaric1930 isobaric1930 1930 W. H. Jones in Brit. Jrnl. Anæsthesia VII. 110 I shall use the terms hyper-, iso- and hypo-baric, to describe solutions which have specific gravities greater than, equal to, or less than that of the cerebro-spinal fluid. 1946 J. L. Southworth et al. Pitkin's Conduction Anesthesia xvii. 761/2 The anesthetist should know in advance whether the anesthetic solution is hypobaric, hyperbaric, or isobaric, so that the posture of the patient can be regulated accordingly. 1947 J. Adriani Techniques & Procedures Anesthesia v. 222 A 2 ½% solution of procaine in distilled water is nearly isobaric. 1962 J. Adriani Chem. & Physics Anaesthesia (ed. 2) xxxi. 653/1 The results obtained with isobaric techniques are unpredictable and variable. 1971 P. C. Lund Princ. & Pract. Spinal Anesthesia vii. 371 Isobaric solutions have not been popular..because of the difficulty of achieving predictable levels of anesthesia. 1971 P. C. Lund Princ. & Pract. Spinal Anesthesia vii. 371 An adaptation of isobaric spinal anesthesia for anorectal surgery was introduced by Jacoby et al. in 1965. B. n. = isobar n. 1b. ΘΚΠ the world > matter > gas > air > [noun] > air-pressure > line in diagram indicating equal isopiestic1873 isobar1892 isobaric1903 1903 Engineer 24 July 83/3 The isobarics of evaporation happen to be isothermals. 1937 M. W. Zemansky Heat & Thermodynamics iv. 56 The series of short isobarics and isovolumics from i to f and the continuous curve from i to f represent other possibilities. This entry has not yet been fully updated (first published 1900; most recently modified version published online March 2021). < adj.n.1877
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