Colloid system or colloidal dispersion is a heterogeneous system which is made up of Dispersed phase and Dispersion medium. In colloidal dispersion one substance is dispersed as very fine particles in another substance called dispersion medium. There are eight kinds of colloid. The kids of colloid are below:
It is important to note that when one gas is mixed with another gas, a homogeneous mixture is formed i.e. gases are completely miscible into each other. Colloidal dispersions are heterogeneous in nature and gas dispersed in another gaseous medium does not form colloidal system.
When the dispersion medium is gas, the solution is called Aerosol and when the dispersion medium is liquid, the colloidal dispersion is known as Sol. Sols can further be classified into different types depending upon the liquid used.
Different Types of Colloidal Dispersion and their examples are summarized in table below.
| Type of Colloidal Dispersions | Examples |
| Foam | Soap, beer, lemonade |
| Solid foam | Pumice stone |
| Liquid Aerosol | Fog, dust |
| Emulsions | Milk, rubber |
| Gel | Butter, Cheese |
| Solid Aerosol | Dust |
| Sol or Colloidal Suspension | Paste, ink |
| Solid sol(solid suspension) | Pearls, gem stones |
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