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The emulsifier is emulsion stabilizer, is a kind of surface active agent. The effect of emulsifier is: when it is dispersed on the surface of the dispersoid, forming a film or electric double layer, can make the dispersed phase with a charge, so you can stop a small let of dispersed phase mutual condensation, the formation of the emulsion is stable. For example, in pesticide TC (solid) or crude oil (liquid) adding certain amount of emulsifier, then they are dissolved in an organic solvent, mixing uniformly can be made of transparent liquid, called ec. Commonly used emulsifier have soap, Arabia glue, sodium etc..