Jean Baptiste Perrin

Jean Baptiste Perrin, generally known as Jean Perrin (September 30, 1870, Lille – April 17, 1942, New York), was a French physicist.

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In 1895, he showed that cathode rays were made of corpuscles with negative electric charge. He computed Avogadro's number through several methods. He explained solar energy by the thermonuclear reactions of hydrogen.

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After Albert Einstein published (1905) his theoretical explanation of Brownian motion in terms of atoms, Perrin did the experimental work to test Einstein's predictions, thereby settling the century-long dispute about John Dalton's atomic theory.

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Jean Perrin received the Nobel Prize in Physics in 1926 for his work on the discontinuous structure of matter, and especially for his discovery of sedimentation equilibrium.

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He was the father of Francis Perrin, also a physicist.

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September 30: September 30 is the 273rd day of the year (274th in leap years) in the Gregorian calendar, with 92 days remaining. It is the last day of September....

1870: 1870 was a common year starting on Saturday (see link for calendar)....

Lille: :The following article is about the city in France. See Lille (disambiguation) for other meanings....

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