ABSTRACT
An emulsion consists of at least two immiscible liquid phases, one of which is dispersed as globules (dispersed phase) in the other liquid phase (continuous phase). Emulsions are thermodynamically unstable and are usually stabilized by the presence of an emulsifying agent. The process of formation of an emulsion is termed emulsication. The diameter of the dispersed phase globules is generally in the range of about 0.1-10 μm, although it can be as small as 0.01 μm or as large as 100 μm. Emulsied systems range from lotions of relatively low viscosity, to ointments and creams, which are semisolid in nature. Pharmaceutical emulsions are used for the administration of nutrients, drugs, and diagnostic agents. Topical creams and lotions are popular forms of emulsions for external use.
