Why the particles of colloidal solution don't settle down?
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The first condition is required because smaller particles are quite light and move randomly due to Brownian motion. Brownian motion occurs in such colloids due to molecules of the liquid hitting the colloid particle. On the other hand, larger particles are heavy and easily settle down.
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In a colloidal solution the colloidal particles are small and they are being continuously hit upon by the molecules of depression medium.
It is very unlikely that the dispersed face particles will be hit upon by an equal force from all the sides.
Therefore there is a resultant force acting upon the colloidal particles in a particular direction.
And colloidal particles execute zigzag motion called Brownian movement.
Because of this the colloidal particles do not settle down under the influence of gravity.
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