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Emulsification is the process of dispersing one liquid into another immiscible liquid (ie mixing 2 things that do not mix naturally). Oil (which attracts dirt) doesn't naturaâ¦lly mix with water. However soap can suspend oil/dirt in such a way that it gets suspended in water and can be removed when we wash it with water.
An emulsifier consists of hydrophilic (water-soluble) part and lipophilic (oil-soluble) part. When an emulsifier is added to a mixture of water and oil, the emulsifier is arranged on the interface, anchoring its hydrophilic part into water and its lipophilic part into oil. On the interface of water/air or oil/air, emulsifiers are arranged, reducing interfacial tension of them and making them easy to be mixed. In other words, the force to separate the oil and water turns weaker, ending up with oil and water easily get emulsified.