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Colloids are particles immersed in fluid that are so small that Brownian Motion keeps them from settling out. Dust particles are a good example of colloids in nature. To study colloids in a controlled way, one can now buy uniform sized spherical polystyrene or silica spheres in sizes ranging from a few tenths to a few tens of mircons. The interacts that occur between the colloids and other particles in the liquid result in their suspension. A good model of this can be seen on the 'Links' page under 'Brownian Motion - Visual Demonstration'.

Colloids in Nature

Colloidal systems are abundent in nature, occurring in clouds, blood, milk and in many other instances.

Colloids in the Lab

Colloids