Question

Define:
Brownian motion​

Answer 1

Answer:

Brownian motion or pedesis is the random motion of particles suspended in a fluid resulting from their collision with the fast-moving molecules in the fluid. This pattern of motion typically alternates random fluctuations in a particle's position inside a fluid sub-domain with a relocation to another sub-domain.

Answer 2

Answer:

(1) Brownian movement : The random ceaseless motion of the colloidal or disperse phase particles taking place in all directions over a large area is called Brownian motion.

(2) Cause of Brownian motion :

(i) This movement arises due to constant bombardment by the molecules of the dispersion medium on the colloidal particles. colloidal particles acquire kinetic energy due to collisions by the dispersion medium molecules.

(ii) Since the colloidal particles are heavier than the molecules of the dispersion medium their Brownian motion is much slower than that of the medium molecules.