Emulsions’ scientific fundamental is two immiscible (or not completely soluble) liquid which is stirred by the strong force and is dispersed in a particulate form to another, called emulsion. But once the agitation was stopped, it will layer, so we need to add the emulsifier at this time. It makes the two-phase interfacial adsorb or aggregate to form a stable emulsion. In this case, the original two incompatible liquids are changed to non-physical properties.