Hess , Germain Henri
(1802–1850) Swiss–Russian chemist
Hess, who was born at Geneva in Switzerland, was taken to Russia as a child by his parents. He studied medicine at the University of Dorpat (1822–25) and started his career by practicing medicine in Irkutsk. In 1830 he moved to St. Petersburg, becoming professor of chemistry at the Technological Institute of the university. While there he wrote a chemistry textbook in Russian, which became a standard work.
Hess worked on minerals and on sugars, but his main work was on the theory of heat. By carefully measuring the heat given off in various chemical changes, he was able to conclude in 1840 that in any chemical reaction, regardless of how many stages there are, the amount of heat developed in the overall reaction is constant.Hess's law, also called the law of constant heat summation, is in fact a special case of the law of conservation of energy.

Scientists. . 2011.

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  • Hess, Germain Henri — ▪ Russian chemist born Aug. 7, 1802, Geneva, Switz. died Nov. 30, 1850, St. Petersburg, Russia       chemist whose studies of heat in chemical reactions formed the foundation of thermochemistry.       After practicing medicine for several years… …   Universalium

  • Hess, Germain Henri — ► (1802 50) Químico ruso de origen suizo. Fue el fundador de la ferroquímica …   Enciclopedia Universal

  • Germain Henri Heß — Germain Henri Hess. Germain Henri Hess (* 7. August 1802 in Genf; † 30. November 1850 in Sankt Petersburg) war ein schweizerisch russischer Chemiker. Leben Hermann Heinrich Hess wurde am 7. August 1802 in Genf als Sohn eines Schweizer Malers… …   Deutsch Wikipedia

  • Germain Henri Hess — Germain Henri Hess. Germain Henri Hess (* 7. August 1802 in Genf; † 30. Novemberjul./ 12. Dezember 1850greg. in Sankt Petersburg) war ein schweizerisch russischer Chemiker und …   Deutsch Wikipedia

  • Germain Henri Hess — Germain Henri Hess. Germain Henri Hess (8 de agosto de 1802 30 de noviembre de 1850) fue un químico y médico suizo que formuló la Ley de Hess, uno de los primeros principios de la termoquímica. Nacido en Ginebra, su padre fue un …   Wikipedia Español

  • Germain Henri Hess — Pour les articles homonymes, voir Hess. Germain Henri Hess. Germain Henri Hess (en russe : Гесс, Герман Иванович) (7 août 1802–30 novembre …   Wikipédia en Français

  • Germain Henri Hess — (8 de agosto de 1802 30 de noviembre de 1850) fue un químico y médico suizo quien formuló la Ley de Hess una de los primeros principios de la termoquímica. Nacido en Ginebra, su padre fue una artista y en 1805 se mudó con su familia a Rusia en… …   Enciclopedia Universal

  • Germain Henri Hess — Infobox Scientist name = PAGENAME box width = image width =150px caption = PAGENAME birth date = August 7, 1802 birth place = Geneva, Switzerland death date = November 30, 1850 death place = St. Petersburg residence = citizenship = nationality =… …   Wikipedia

  • Germain Hess — Germain Henri Hess Pour les articles homonymes, voir Hess. Germain Henri Hess. Germain Henri Hess (en russe : Гесс, Герман Иванович) (7 a …   Wikipédia en Français

  • Hess — Hess, Germain Henri Hess, Rudolf Hess, Victor Franz Hess, Walter Rudolph * * * (as used in expressions) Hess, (Walter Richard) Rudolf Hess, Victor Francis Hess, Walter Rudolf …   Enciclopedia Universal

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