What are examples of colloids?

1 Answer
Dec 21, 2016

Here are some common examples.



A colloid is a mixture whose particles range in size from 1 nm to 1000 nm and do not settle out on standing.

The colloidal particles are distributed in a dispersing medium, which can be a solid, liquid, or a gas.

Examples of colloids

(a) Gas dispersed in liquid (foams)


Whipped cream consists of tiny air bubbles dispersed in the liquid cream.

(b) Gas dispersed in a solid (solid foams)


Marshmallows consist of tiny air bubbles dispersed in a solid consisting of sugar and gelatin.

(c) Liquid dispersed in gas (fogs or aerosols)


Common fog is a dispersion of water droplets in the air.

(d) Liquid dispersed in liquid (emulsions)


Milk is an emulsion of liquid butterfat globules dispersed in a water-based solution.

(e) Liquid dispersed in solid (solid emulsions)


Butter is an emulsion of water droplets in solid butterfat.

(f) Solid dispersed in gas (smokes)


Smoke is a dispersion of finely divided soot particles in the atmosphere.

(g) Solid dispersed in liquid (sols and gels)


Gelatin is a dispersion of the protein molecules of gelatin in water.