Why do colloidal particles in a colloid not aggregate together to form bigger particles and settle down?
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The particles in a colloid are large enough to scatter light, a phenomenon called the Tyndall effect. ... Clouds are colloidal mixtures. They are composed of water droplets that are much largerthan molecules, but that are small enough that they do not settle out.
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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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