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Emile Hilaire Amagat
Born January 2, 1841(1841-01-02)
Saint-Satur, France
Died February 15, 1915 (aged 74)
Saint-Satur, France
Residence France
Nationality French
Fields Physics, Thermodynamics
Known for Amagat's law, Hydraulic Manometer

Emile Hilaire Amagat (2 January 1841 – 15 February 1915) was a French physicist. His doctoral thesis, published in 1872, expanded on the work of Thomas Andrews, and included plots of the isotherms of carbon dioxide at high pressures.[1] Amagat published a paper in 1877 that contradicted the current understanding at the time, concluding that the coefficient of compressibility of fluids decreased with increasing pressure.[1] He continued to publish data on isotherms for a number of different gases between 1879 and 1882[1] , and invented the hydraulic manometer, which was able to withstand up to 3200 atmospheres, as opposed to 400 atmospheres using a glass apparatus.[2] In 1880 he published his Law of Partial Volumes.

Amagat was elected a member of the French Academy of Sciences on 9 June 1902.[3] A unit of number density, amagat, was named after him.


  1. ^ a b c Daintith, John (1981). "Amagat, Emile Hilaire". Biographical Encyclopedia of Scientists. 1. New York: Facts On File, Inc.. pp. 15. ISBN 0871963965.  
  2. ^ Bridgman, P. W. (1909). "An absolute gauge for measuring high hydrostatic pressures". Physical Review (Series I) (American Physical Society) 28 (2): 145. doi:10.1103/PhysRevSeriesI.28.140.  
  3. ^ Payen, Jacques (1970). "Amagat, Émile". Dictionary of Scientific Biography. 1. New York: Charles Scribner's Sons. pp. 128–129. ISBN 0684101149.  .


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