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CHRISTIAN KOCH, MICROCHEMICALS / SCIENCE PHOTO LIBRARY CHRISTIAN KOCH, MICROCHEMICALS / SCIENCE PHOTO LIBRARY
Brownian motion. Animation showing the cause of Brownian motion, the random motion of visible particles (white spheres) in a gas or liquid. This random motion is caused by the particles colliding with the molecules or atoms (blue) in the surrounding gas or liquid. These molecules or atoms (shown here) are not visible to the human eye. This is represented by the blue spheres fading out midway through the animation.
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