Colloidal solutions can be classified as follows on the basis of their dispersed phase and dispersion medium :
Dispersed phase | Dispersion medium | Type of colloid | Example | |
1. | Solid | Solid | Solid Sol | Gemstone |
2. | Solid | Liquid | Sol | Paint |
3. | Solid | Gas | Aerosol | Smoke |
4. | Liquid | Solid | Gel | Cheese |
5. | Liquid | Liquid | Emulsion | Milk |
6. | Liquid | Gas | Aerosol | Fog |
7. | Gas | Solid | Solid foam | Pumice stone |
8. | Gas | Liquid | Foam | Froth |