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Brownian motion
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Two-panel diagram illustrating Brownian motion. The top shows a Brownian particle among randomly moving blue molecules, while the bottom highlights uneven molecular collisions on the particle's surface, causing its movement.
Diagram illustrating Brownian motion, showing red and brown circles representing particles above and below a blue wavy line, with many small gray dots symbolizing atoms.
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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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Albert Einstein's Theory of Brownian Motion
Learn about Albert Einstein's theory of Brownian motion and how he derived the size...
Video: © MinutePhysics (A Britannica Publishing Partner)

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Brownian particle
(Left) Random motion of a Brownian particle and (right) random discrepancy between...
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