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Jean Baptiste Perrin

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Title: Jean Baptiste Perrin  
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Subject: Avogadro constant, Brownian motion, Nobel Prize in Physics, People associated with the Royal Society, French physical chemists
Collection: 1870 Births, 1942 Deaths, 20Th-Century Physicists, Burials at the Panthéon, Paris, Commanders of the Order of Leopold (Belgium), Commandeurs of the Légion D'Honneur, Corresponding Members of the Russian Academy of Sciences (1917–25), Corresponding Members of the Ussr Academy of Sciences, École Normale Supérieure Alumni, Foreign Members of the Royal Society, French Atheists, French National Centre for Scientific Research, French Nobel Laureates, French Physical Chemists, French Physicists, French Socialists, Honorary Members of the Ussr Academy of Sciences, Members of the French Academy of Sciences, Nobel Laureates in Physics, People Associated with the Royal Society, Pupils of Darius Milhaud, Theoretical Physicists, University of Paris Alumni
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Jean Baptiste Perrin

Jean Baptiste Perrin
Perrin in 1926
Born (1870-09-30)30 September 1870
Lille, France
Died 17 April 1942(1942-04-17) (aged 71)
New York City, USA
Nationality France
Fields Physics
Institutions École Normale Supérieure
University of Paris
Alma mater École Normale Supérieure
Known for Nature of cathode rays
Brownian motion
Notable awards Matteucci Medal (1911)
Nobel Prize in Physics (1926)

Jean Baptiste Perrin ForMemRS[1] (30 September 1870 – 17 April 1942) was a French physicist who, in his studies of the Brownian motion of minute particles suspended in liquids, verified Albert Einstein’s explanation of this phenomenon and thereby confirmed the atomic nature of matter (sedimentation equilibrium). For this achievement he was honoured with the Nobel Prize for Physics in 1926.[2]


  • Biography 1
    • Early years 1.1
    • Research and achievements 1.2
    • Personal life 1.3
  • References 2
  • External links 3


Early years

Born in Lille, France, Perrin attended the École Normale Supérieure, the elite grande école in Paris. He became an assistant at the school during the period of 1894–97 when he began the study of cathode rays and X-rays. He was awarded the degree of docteur ès sciences (PhD) in 1897. In the same year he was appointed as a lecturer in physical chemistry at the Sorbonne, Paris. He became a professor at the University in 1910, holding this post until the German occupation of France during World War II.

Research and achievements

Jean Perrin in 1908

In 1895, Perrin showed that cathode rays were of negative electric charge in nature. He determined Avogadro's number (now known as the Avogadro constant) by several methods. He explained solar energy as due to the thermonuclear reactions of hydrogen.

After Albert Einstein published (1905) his theoretical explanation of Brownian motion in terms of atoms, Perrin did the experimental work to test and verify Einstein's predictions, thereby settling the century-long dispute about John Dalton's atomic theory. Carl Benedicks argued Perrin should receive the Nobel Prize in Physics; Perrin received the award in 1926 for this and other work on the discontinuous structure of matter, which put a definite end to the long struggle regarding the question of the physical reality of molecules.[3]

Perrin was the author of a number of books and dissertations. Most notable of his publications were: "Rayons cathodiques et rayons X" ; "Les Principes"; "Electrisation de contact"; "Réalité moléculaire"; "Matière et Lumière"; "Lumière et Reaction chimique".

Perrin was also the recipient of numerous prestigious awards including the Joule Prize of the Royal Society in 1896 and the La Caze Prize of the French Academy of Sciences. He was twice appointed a member of the Solvay Committee at Brussels in 1911 and in 1921. He also held memberships with the Royal Society of London and with the Academies of Sciences of Belgium, Sweden, Turin, Prague, Romania and China. He became a Commander of the Legion of Honour in 1926 and was made Commander of the Order of Léopold (Belgium).

In 1919, Perrin proposed that nuclear reactions can provide the source of energy in stars. He realized that the mass of a helium atom is less than that of four atoms of hydrogen, and that the mass-energy equivalence of Einstein implies that the combination 4 H → He could liberate sufficient energy to make stars shine for billions of years. It remained for Hans Bethe and Carl Friedrich von Weizsäcker to determine the detailed mechanism of stellar nucleosynthesis during the 1930s.[4] · [5]

In 1927, he founded the Institut de Biologie Physico-Chimique together with chemist André Job and physiologist André Mayer. Funding was provided by Edmond James de Rothschild.[6] In 1937, Perrin established the Palais de la Découverte, a science museum in Paris.

Perrin is considered the founding father of the National Centre for Scientific Research (Centre National de la Recherche Scientifique (CNRS)). Following a petition by Perrin signed by over 80 scientists, among them eight Nobel Prize laureates, the French education minister set up the Conseil Supérieur de la Recherche Scientifique (French National Research Council) in April 1933. In 1936, Perrin, now an undersecretary for research, founded the Service Central de la Recherche Scientifique (French Central Agency for Scientific Research).[6] Both institutions were merged under the CNRS umbrella on October 19, 1939.[7]

His notable students include Pierre Victor Auger. Jean Perrin was the father of Francis Perrin, also a physicist.

Personal life

Perrin was an atheist and a socialist.[8] He was an officer in the engineer corps during World War I. When the Germans invaded France in 1940, he escaped to the U.S.A. He died in New York City. After the War, in 1948, his remains were transported back to France by the battleship Jeanne d'Arc and buried in the Panthéon.


  1. ^
  2. ^
  3. ^
  4. ^ Why the Stars Shine D.Selle, Guidestar (Houston Astronomical Society), October 2012, p.6-8
  5. ^ Cosmos: An Illustrated History of Astronomy and CosmologyJohn North, (University of Chicago Press, p.545)
  6. ^ a b
  7. ^
  8. ^

External links

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