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Brownian motion
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Brownian particle
Learn about Albert Einstein's theory of Brownian motion and how he derived the size of atoms based on how much the Brownian particles move
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Italian-born physicist Dr. Enrico Fermi draws a diagram at a blackboard with mathematical equations. circa 1950.
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Brownian particle
Brownian particle (Left) Random motion of a Brownian particle and (right) random discrepancy between the molecular pressures on different surfaces of the particle that cause motion.

Brownian motion

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Also known as: Brownian movement
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Also called:
Brownian movement
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motion
kinetic theory
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Brownian motion, any of various physical phenomena in which some quantity is constantly undergoing small, random fluctuations. It was named for the Scottish botanist Robert Brown, the first to study such fluctuations (1827). If a number of particles subject to Brownian motion are present in a given medium and there is no preferred direction for the random oscillations, then over a period of time the particles will tend to be spread evenly throughout the medium. Thus, if A and B are two adjacent regions and, at time t, A contains twice as many particles as B, at that instant the ...(100 of 1087 words)

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