James Dewar


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Dewar, James

 

Born Sept. 20, 1842, in Kincardine-on-Forth, Scotland; died Mar. 27, 1923, in London. British physicist and chemist. Member of the Royal Society of London (1877).

Dewar graduated from the University of Edinburgh in 1861. He was a professor at Cambridge University (from 1875) and at the Royal Institution in London (from 1877). He was also president of the Chemical Society of England (1897). Dewar studied carbonyl compounds and ozone. In 1871 he proposed structural formulas for benzene and pyridine. His principal works dealt with the study of thermal phenomena. In 1872 he worked out methods of measuring specific heat at low temperatures and discovered that it decreases with decreasing temperature. In 1898 he obtained liquid hydrogen for the first time and determined its constants. Dewar invented a vessel in which bodies can retain their temperatures for long periods of time. He investigated the change in the electrical conductivity of metals as a function of temperature. In collaboration with P. Curie he experimentally proved (1904) that helium is formed during the radioactive decay of radon.

WORKS

Collected Papers, vols. 1–2. Cambridge, 1927.

REFERENCE

“Sir J. Dewar (1842-1923).” Proceedings of the Royal Society of London. Series A, 1926, vol. III , no. 759.
References in periodicals archive ?
NAC went second with a 3-0 win over Kestrels, Tony Grey (2) and James Dewar the scorers.
Trower, however, moved on after the -rst -ve albums and for a while fronted a band called Jade which feature Frankie Miller (vocals), Clive Bunker (later of Jethro Tull on drums) and longtime Trower, however, moved on after the -rst -ve albums and for a while fronted a band called Jade which feature Frankie Miller (vocals), Clive Bunker (later of Jethro Tull on drums) and longtime Trower sideman, James Dewar (of Stone e Crows) on bass.
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1842: Sir James Dewar,Scottish physician and chemist,and inventor of the vacuum flask, was born in Fife.
1842: Sir James Dewar, Scottish physician and chemist and inventor of the vacuum flask, was born at Kincardine-on-Forth.
Sir James Dewar invented the vacuum flask in 1892, originally to store liquid nitrogen in his laboratory.
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VACUUM FLASK: Physicist Sir James Dewar discovered that by creating a thermal insulation or vacuum between the contents of a vessel and the environment, it would keep the contents hotter/cooler.
This naturally carried on to some of the famous inventors that we have had in history, like Alexander Graham Bell, who invented the telephone, and Sir James Dewar, the inventor of the Dewar flask.