Question

Explain the phenomenon of Brownian movement giving reasons for the occurrence of this phenomena.

Answer 1

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Brownian movement also called Brownian motion is defined as the uncontrolled or erratic movement of particles in a fluid due to their constant collision with other fast-moving molecules.

Brownian motion is the random motion of a particle as a result of collisions with surrounding gaseous molecules. Diffusiophoresis is the movement of a group of particles induced by a concentration gradient. This movement always flows from areas of high concentration to areas of low concentration.

Answer 2

• Zig-zag motion of colloidal particles is independent of the nature of colloid but depend on the size of the particle and viscosity of solution.

• The motion becomes less vigorous as the size of the particle increases and also with the viscosity of the dispersion medium.

• It increases with rise in temperature.

• The brownian movement has been explained due to the unbalanced bombardment of the particles by the molecules of the dispersion medium.

• The brownian movement does not permit the particles to settle and thus is responsible for the stability of sols.