Dewarn.

Brit.

/ˈdjuːə/, U.S.

/ˈduwər/

Forms: Also dewar.

Etymology: < the name of Sir James Dewar (1842–1923), British physicist and chemist.

Used attributively or absol. to designate a double-walled vessel or flask, usually of glass or copper, having the space between the walls empty of air to prevent conduction and convection of heat to and from the inner container. Cf. vacuum bottle n., vacuum flask n., and vacuum-vessel n. at vacuum n. Compounds 1a.

ΘΚΠ

society > occupation and work > equipment > receptacle or container > vessel > flask, flagon, or bottle > [noun] > flask > vacuum flask

Thermos1907

vacuum bottle1910

vacuum flask1917

Dewar1966

1899 T. O'C. Sloane Liquid Air xi. 246 The Dewar vacuum bulb consists of a double or treble walled glass vessel, with the space or spaces between the vessels hermetically sealed and with a nearly perfect vacuum therein.

1899 T. O'C. Sloane Liquid Air xi. 248 Various shapes and modifications of Dewar bulbs.

1902 Encycl. Brit. XXX. 281/2 Vacuum or ‘Dewar’ vessels.

1930 Engineering 5 Sept. 314/1 A calorimeter consisting of a wide-necked Dewar flask, [etc.].

1964 N. G. Clark Mod. Org. Chem. vii. 112 The reaction is carried out in a Dewar vessel.

1966 New Scientist 21 July 138/3 A replenisher that automatically maintains the level of liquefied gas in a dewar has been developed.

Draft additions 1993

b. Chemistry. Used attributively with reference to a possible structure (proposed by Dewar) for the benzene molecule in which one bond forms a bridge across the benzene ring; Dewar benzene, the isomer of benzene having a Dewar structure.

ΘΚΠ

the world > matter > chemistry > organic chemistry > hydrocarbons > [adjective] > benzene > Dewar benzene

Dewar1913

the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > benzene > Dewar benzene

Dewar benzene1962

1913 J. B. Cohen Org. Chem. Adv. Students II. v. 387 That the parallel double linkage of the Dewar formula is responsible for luminescence..is seen in certain hydropyridine carboxylic esters.

1949 G. W. Wheland Adv. Org. Chem. (ed. 2) x. 420 Approximate calculations have..led to the conclusion that the Dewar structures are of only small (although still far from insignificant) importance in the resonance.

1962 Van Tamelen & Pappas in Jrnl. Amer. Chem. Soc. 84 3790/1 In this contribution we describe a hydrocarbon the properties of which lead us to propose that it is the first isolated member of the ‘Dewar benzene’ class.

1979 Jrnl. Org. Chem. USSR 15 1401 (heading) Calculation of the reaction paths for 1,3-sigmatropic shifts of the C–S bond in allyl hydrosulfide and Dewar thiophene.

1987 Jrnl. Amer. Chem. Soc. 109 7888/1 The high aromatization temperature required for a short-bridged Dewar benzene has precedent.

This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022).

单词	dewar
释义	Dewarn. Brit. /ˈdjuːə/, U.S. /ˈduwər/ Forms: Also dewar. Etymology: < the name of Sir James Dewar (1842–1923), British physicist and chemist. Used attributively or absol. to designate a double-walled vessel or flask, usually of glass or copper, having the space between the walls empty of air to prevent conduction and convection of heat to and from the inner container. Cf. vacuum bottle n., vacuum flask n., and vacuum-vessel n. at vacuum n. Compounds 1a. ΘΚΠ society > occupation and work > equipment > receptacle or container > vessel > flask, flagon, or bottle > [noun] > flask > vacuum flask Thermos1907 vacuum bottle1910 vacuum flask1917 Dewar1966 1899 T. O'C. Sloane Liquid Air xi. 246 The Dewar vacuum bulb consists of a double or treble walled glass vessel, with the space or spaces between the vessels hermetically sealed and with a nearly perfect vacuum therein. 1899 T. O'C. Sloane Liquid Air xi. 248 Various shapes and modifications of Dewar bulbs. 1902 Encycl. Brit. XXX. 281/2 Vacuum or ‘Dewar’ vessels. 1930 Engineering 5 Sept. 314/1 A calorimeter consisting of a wide-necked Dewar flask, [etc.]. 1964 N. G. Clark Mod. Org. Chem. vii. 112 The reaction is carried out in a Dewar vessel. 1966 New Scientist 21 July 138/3 A replenisher that automatically maintains the level of liquefied gas in a dewar has been developed. Draft additions 1993 b. Chemistry. Used attributively with reference to a possible structure (proposed by Dewar) for the benzene molecule in which one bond forms a bridge across the benzene ring; Dewar benzene, the isomer of benzene having a Dewar structure. ΘΚΠ the world > matter > chemistry > organic chemistry > hydrocarbons > [adjective] > benzene > Dewar benzene Dewar1913 the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > benzene > Dewar benzene Dewar benzene1962 1913 J. B. Cohen Org. Chem. Adv. Students II. v. 387 That the parallel double linkage of the Dewar formula is responsible for luminescence..is seen in certain hydropyridine carboxylic esters. 1949 G. W. Wheland Adv. Org. Chem. (ed. 2) x. 420 Approximate calculations have..led to the conclusion that the Dewar structures are of only small (although still far from insignificant) importance in the resonance. 1962 Van Tamelen & Pappas in Jrnl. Amer. Chem. Soc. 84 3790/1 In this contribution we describe a hydrocarbon the properties of which lead us to propose that it is the first isolated member of the ‘Dewar benzene’ class. 1979 Jrnl. Org. Chem. USSR 15 1401 (heading) Calculation of the reaction paths for 1,3-sigmatropic shifts of the C–S bond in allyl hydrosulfide and Dewar thiophene. 1987 Jrnl. Amer. Chem. Soc. 109 7888/1 The high aromatization temperature required for a short-bridged Dewar benzene has precedent. This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022). < n.1899
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