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Brownian Motion

Brownian Motion

Applet clearly demonstrates Brownian motion in two dimensions. The small particles are shown as well as the large particle.


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Barbra Bied Sperling
Barbra Bied Sperling (Administrator)
21 years ago


I spent about 30 minutes trying different things with this item. I like it a lot -- it is simple, but very
effective in illustrating the phenomenon of Brownian motion, as well as effects of interatomic collisions. The
ability to slow the atoms down and to change the mass ratio is quite revealing. The only problem
I discovered is that it displays very bad physics at mass ratios near 1.0 -- the red particle seems to gain energy
with every collision, and is soon is whipping around at speeds much higher than the other particles.

It would have been nice had the author told us what force model is being used; it is not a hard sphere force.

John Walkup
John Walkup (Staff)
22 years ago

Technical Remarks: