What are examples of colloids?
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.