Langevin, Paul pōl läNzhəvăN´ [key], 1872–1946, French physicist and chemist. He was professor of experimental physics at the Collège de France from 1909 and at the École municipale de Physique et de Chimie, Paris, from 1904 (director from 1929); dismissed by the Vichy government in 1940, he resumed his posts in 1944. He is noted for his work on the electron theory of magnetism and for his research on sound devices for submarine detection.
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