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Single grain of dust
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What you can see is a single grain of dust, initially at rest, floating in still air.

Let the simulation run for a few minutes.

questions.gif (805 bytes)

Does the dust grain always follow the same path?

Why does the dust grain move like this?

The grain is reacting with the air
The grain is bombarded by air molecules from random directions
The grain is influenced by gravitational forces

Click here for notes on the simulation.

[ Brownian motion Applet ]
 

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