Question: what are the three essential components that must be present in all pharmaceutical emulsions?
Answer: 3.1. 1.1 Emulsions. Emulsions are heterogeneous systems composed of at least two immiscible liquids, water and oil, one of which is usually uniformly dispersed as fine droplets throughout the other liquid phase by a mechanical agitation process. Emulsions are considered as a type of liquid–liquid colloid.