(i) Alcosol : The sol in which alcohol is used as dispersion mediumis called alcosol e.g., sol of cellulose nitrate in ethyl alcohol.
(ii) Aerosol : The sol in which dispersion medium is gas and dispersedphase is either solid or liquid, the colloidal system is called aerosol e.g.,fog, insecticides, sprays, etc.
(iii) Hydrosol : The sol in which dispersion medium is water is calledhydrosol e.g., starch sol.