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A colloid is a mixture where one phase is microscopically mixed within another phase. The table below gives examples for all the possible colloids.
Phase | Gas | Liquid | Solid |
Gas | No known examples | Liquid aerosol e.g. fog, mist | Solid aerosol e.g. smoke |
Liquid | Foam e.g. shaving cream | Emulsion e.g. milk, mayonnaise | Sol e.g. blood |
Solid | Solid foam e.g. styrofoam | Gel e.g. butter | Solid sol e.g. steel |

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