What are the different types of colloids?

Answer

Colloids are generally classified into four types: emulsion, sol, aerosol and foam. The combination of fog and smoke makes up an aerosol, which is comprised of solid particles or liquid droplets dispersed throughout a gas phase. Mayonnaise is an emulsion, which are two liquids dispersed together.

In addition, foam is formed when gas is dispersed to either a solid or liquid medium, like lava or soap suds. Paint, a mixture of a solid particle into a liquid medium, is a type of sol. A mixture of a suspended particle and a solvent, a colloid is made up of particles that are too small to see but are still larger than a molecule. Colloids appear similar to solutions, but unlike solutions, colloid particles don't settle out to the bottom for an extended period of time and will just float.

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