explain why particle of colloidal solution don't Settle Down When left and distributed
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Particles of a colloidal solution are small and not heavy...whereas in suspension the particles are big enough, so the particles in a suspension settle down whereas in a colloidal solution the particles do not 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.