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Brownian motion
(redirected from Brown movement)

   Also found in: Dictionary/thesaurus, Medical, Wikipedia 0.01 sec.

Brownian motion

Any of various physical phenomena in which some quantity is constantly undergoing small, random fluctuations. It was named for Robert Brown, who was investigating the fertilization process of flowers in 1827 when he noticed a “rapid oscillatory motion” of microscopic particles within pollen grains suspended in water. He later discovered that similar motions could be seen in smoke or dust particles suspended in air and other fluids. The idea that molecules of a fluid are constantly in motion is a key part of the kinetic theory of gases, developed by James Clerk Maxwell, Ludwig Boltzmann, and Rudolf Clausius (1822–88) to explain heat phenomena.



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A vibrant movement for community control of public schools in predominantly black and Puerto Rican areas throughout Brooklyn and Harlem also provided a context for increased black and brown movement militancy on the City College and Lehman College campuses.
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