Colloids
There are several types of colloid:
- aerosol (gas + liquid or solid, e.g. fog and smoke),
- foam (liquid + gas, e.g. whipped cream),
- emulsion (liquid + liquid, e.g. milk),
- sol (liquid + solid, e.g. paint),
- solid foam (solid + gas, e.g. marshmallow),
- solid emulsion (solid + liquid, e.g. butter),
- solid sol (solid + solid, e.g. ruby glass).