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Julius Thomsen : ウィキペディア英語版
Hans Peter Jørgen Julius Thomsen

Hans Peter Jørgen Julius Thomsen (16 February 1826 – 13 February 1909) was a Danish chemist noted in thermochemistry for the Thomsen–Berthelot principle.
== Life and work ==

Thomsen was born in Copenhagen, and spent his life in that city. From 1847 to 1856 he taught chemistry at the Polytechnic, where from 1883 to 1892 he was the director. From 1856 to 1866 he was on the staff of the military high school. In 1866 he was appointed professor of chemistry at the university, and retained that chair until his retirement from active work in 1891.
A friend and colleague of Ludwig A. Colding, who was one of the early advocates of the principle of conservation of energy, Thomsen did much to found the field of thermochemistry. In particular, between 1869 and 1882, he carried out a great number of determinations of the heat evolved or absorbed in chemical reactions, such as the formation of salts, oxidation and reduction, and the combustion of organic compounds. His collected results were published from 1882 to 1886 in four volumes under the title ''Thermochemische Untersuchungen'', and also a resume in English under the title "Thermochemistry" in 1908. In 1857 he established in Copenhagen a process for manufacturing soda from cryolite, obtained from the west coast of Greenland.
Thomsen was elected a member of the Royal Swedish Academy of Sciences in 1880.
His brother, Carl August Thomsen (1834–1894), was lecturer on technical chemistry at the Copenhagen Polytechnic, and a second brother, Thomas Gottfried Thomsen (1841–1901), was assistant in the chemical laboratory at the university until 1884, when he abandoned science for theology, subsequently becoming minister at Norup and Randers.

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