Emulsions are thermodynamically unstable heterogeneous biphasic systems consisting of at least one immiscible liquid, which is dispersed as globules (the interal, discontinuous or dispersed phase) in the other liquid phase (the external, continuous phase or dispersion medium), which is stabilised by the presence of an emulsifying agent. Internal phase droplets are generally in the range of diameter 0.1 mm 100 mm. Credit:- the face shop 1) Oil-in-water (o/w) emulsions: Emulsions are biphasic liquid systems, one phase of which is usually polar (i.e. aqueous), while the other is relatively non-polar (i.e. oil). When oil droplets are dispersed in the continuous aqueous phase, the emulsion is termed as oil-in-water (o/w) emulsion. 2) Water-in-oil (w/o) emulsions: When oil phase serves as the continuous phase and wate droplets as internal phase, the emulsion is water-in-oil (w/o) emulsion. Credit:- toppr.com 3) Multiple emulsions: These are of two types, o/w/o and w/o/w type. The oil-
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