January 23, 1872 (14 Xinwei the twelfth lunar month), the birth of the famous French physicist Langevin.


Paul Langevin million (1872 to 1946), French physicist. Born in Paris on January 23, 1872, 1888 and 1893, has admitted to the Paris Higher Institute of Physical and Chemical Ecole Normale Sup��rieure, in 1909, he served as a professor of the College de France, was elected to the French Academy of Sciences in 1934, 1930 and 1933, had two was re-elected as the Solvay Physics Conference Chairman. 1905 magnetic theory, primitive magnet made a classic description of the concept of the paramagnetic and diamagnetic substances. In 1908, development of the fluctuation theory of Brownian motion. During World War I, in order to detect the submarine, using quartz piezoelectric vibration get water ultrasound. He strongly opposed the fascist and oppose aggression, arrested and imprisoned during World War II, was the German occupiers. China after the incident, he carried out a variety of activities solidarity with China, and criticized the international coalition connivance of the Japanese invaders. December 19, 1946, Langevin, who passed away in Paris.