If tiny particles like pollen are added to clear water and observed through a micrscope they will be seen to move about randomly. This was an early clue to the fact that matter is made of individual...
The brownian motion is the random movemement of microscopic particles suspended in a liquid or gas, caused by collisions with molecules of the surrounding medium.
It is the movement of small particles caused by the fact that air mollecules are moving at high speed and hit the particles. It was firs noticed in pollen by a guy called Brown (so the name). He...