Question

What is brownian motion?

Answer 1

the erratic random movement of microscopic particles in a fluid, as a result of continuous bombardment from molecules of the surrounding medium

Answer 2

Answer:

BROWNIAN MOTION :-)

In 1827, Scottish Botanist Robert Brown, while examining pollen grains of a flower suspended in water under microscope, noticed that they continuously more about in a zig-zag random motion. This irregular motion of the suspended particles is called Brownian motion. It provided a direct evidence for the existence of molecule and their motion.

Cause ::-))

Any object suspended in a fluid is continuously bombarded by the fluid molecules from all directions. If the object is sufficiently small but still visible under a microscope , the impact of molecules from all side gives rise to an unbalanced force in a certain direction. As soon as the particle moves a little, the magnitude and direction of the unbalanced force change making the particle moving in a new direction. The suspended object thus moves about in a zig-zag manner and troubles about randomly.