Pictet , Raoul Pierre
(1846–1929) Swiss chemist and physicist
Born in Geneva, Pictet was professor of physics at the university there from 1879 and at the University of Berlin from 1886. He later moved to Paris.
Pictet was first interested in the production of artificial ice and then turned his attention to the study of extremely low temperatures and the liquefaction of gases. On 22 December 1877 he was involved in one of those strange simultaneous discoveries that sometimes occur in science. He announced on that day, by telegram to the French Academy, that he had liquefied oxygen. Just two days later the French physicist Louis Cailletet made a similar announcement.
Both Pictet and Cailletet had recognized that both cooling and compression were necessary to liquefy oxygen but they had achieved this using different techniques. Pictet had used his cascade method, in which he evaporated liquid sulfur dioxide to liquefy carbon dioxide, which in turn was allowed to evaporate and to cool oxygen to below its critical temperature. The oxygen could then be liquefied by pressure. The advantage over Cailletet's method was that it produced the liquid gas in greater quantity and was easier to apply to other gases.

Scientists. . 2011.

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  • Raoul Pierre Pictet — Raoul Pictet. Raoul Pierre Pictet (* 4. April 1846 in Genf; † 27. Juli 1929 in Paris) war ein Schweizer Physiker. Pictet war seit 1879 Professor an der Universität Genf und machte sich insbesondere dadurch bekannt, indem er nachwies, dass… …   Deutsch Wikipedia

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  • Raoul Pictet — Raoul Pierre Pictet né le 4 avril 1846 à Genève (Suisse), meurt le 27 juillet 1929 à Paris (France) est un physicien qui obtient pour la première fois, la liquéfaction de l azote et de l’oxygène par l’action sim …   Wikipédia en Français

  • Raoul Pictet — Raoul Pictet. Raoul Pierre Pictet (* 4. April 1846 in Genf; † 27. Juli 1929 in Paris) war ein Schweizer Physiker. Pictet war seit 1879 Professor an der Universität Genf und machte sich insbesondere dadurch bekannt, dass er nachwies, dass …   Deutsch Wikipedia

  • Pictet — (Raoul Pierre) (1846 1929) physicien suisse; pionnier de la liquéfaction des gaz (oxygène et azote en 1877) …   Encyclopédie Universelle

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  • Pictet —   [pik tɛ],    1) Amé, schweizerischer Chemiker, * Genf 12. 7. 1857, ✝ ebenda 11. 3. 1937; seit 1894 Professor in Genf, arbeitete über Alkaloide und Kohlenhydrate. Mit dem Biochemiker Hans Vogel (* 1900) stellte Pictet 1928 erstmals die… …   Universal-Lexikon

  • Raoul Pictet — Infobox Scientist name = Raoul Pierre Pictet box width = image width =150px caption = Raoul Pierre Pictet birth date = 4 April 1846 birth place = Geneva death date = 27 July 1929 death place = Paris residence = citizenship = nationality = Swiss… …   Wikipedia

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