Brown motion
Definition:
Brownian motion is the random zig-zag movement of very tiny particles when they are in a liquid or gas.
Why does it happen?
Tiny particles are hit from all sides by fast-moving molecules of the liquid or gas.
These hits are unequal, so the particle moves here and there.
Who discovered it?
Robert Brown (a scientist) observed it in 1827 while watching pollen grains in water.
Main Points :
Happens to very small particles
Seen in liquids and gases
Movement is random, not straight
Shows that molecules are always moving.
Example:
Pollen grains dancing in water under a microscope
Smoke particles moving in air.
Fun Fact :
Even when water looks still, its molecules are busy moving, making tiny particles dance!
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