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Milk is an example of:
Oil dispersed in water type of emulsion.
Oil dispersed in oil type of emulsion.
Water dispersed in oil type of emulsion.
None of the above.
Answers (1)
Emulsions are liquid-liquid colloidal systems (dispersion of finely divided droplets in another liquid). Emulsion is prepared when mixture of two immiscible or partially miscible liquids are shaken. They separate into two layers on standing. A third component called emulsifying agent is added for stabilization. It forms an interfacial film between suspended particles and the medium.
Emulsion is of two types:
1) Oil dispersed in water (O/W type)
2) Water dispersed in oil (W/O type)
Oil dispersed in water (O/W type):
Here, water act as dispersion medium
Examples: Milk and Nourishing cream.
Water dispersed in oil (W/O type):
Here, oil act as dispersion medium
Example: Butter.
Demulsification: It is the separation of an emulsion into its constituent liquids. It can be achieved by freezing, heating, centrifugation, etc.
Hence option 1 is correct.
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