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L. What are emulsions ? What are their differenttypes ? Give one example of each type.

Answer»

In an emulsion, oneliquid(the dispersed phase) is dispersed in the other (thecontinuousphase).

Depending upon the nature of the dispersed phase, the emulsions are classified as;

(i)Oil-in-water emulsions(O/W):The emulsion in which oil is present as the dispersed phase and water as the dispersion medium(continuous phase)is called an oil-in-water emulsion. Milk is an example of the oil-in-water type of emulsion. In milk liquid fat globules are dispersed in water. Other examples are, vanishing cream etc.

(ii)Water-in-oil emulsion(W/O):The emulsion in which water forms the dispersed phase, and the oil acts as the dispersion medium is called a water-in-oil emulsion. These emulsion are also termedoil emulsions. Butterandcold creamare typical examples of this types of emulsions. Other examples are cod liver oil etc.


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