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Question
How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?
Solution
One criterion for classifying colloids is the physical state of the dispersed phase and dispersion medium. Depending upon the type of the dispersed phase and dispersion medium (solid, liquid, or gas), there can be eight types of colloidal systems.
| Dispersed phase | Dispersion medium | Type of colloid | Example |
| Solid | Solid | Solid Sol | Gemstone |
| Solid | Liquid | Sol | Paint |
| Solid | Gas | Aerosol | Smoke |
| Liquid | Solid | Gel | Cheese |
| Liquid | Liquid | Emulsion | Milk |
| Liquid | Gas | Aerosol | Fog |
| Gas | Solid | Solid foam | Pumice stone |
| Gas | Liquid | Foam | Froth |
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