Brownian Motion

Small particles suspended in liquid move spontaneously in a random fashion. The motion is caused by unbalanced impacts of molecules on the particle. Brownian motion provided strong circumstantial evidence for the existence of molecules.

Historical Notes
1827 Brown discovered Brownian motion.
1905 Einstein published papers on Brownian motion, the photoelectric effect, and the special theory of relativity.

See also: Brown, Robert.

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Subjects: Physics