explain why particles of collidal solution do not settle down when settla down when undisturbed while in the case of suspension they do?
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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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