Final answer:
An emulsion is a stable mixture of two or more mixable substances, where one substance is dispersed as droplets throughout the other substance. Emulsions are stabilized by an emulsifying agent and may be difficult to separate due to the mutual insolubility of the liquids involved. Examples of emulsions include milk and mayonnaise.
Step-by-step explanation:
An emulsion is a stable mixture of two or more mixable substances where one substance is dispersed as droplets throughout the other substance. Emulsions are colloids formed by the dispersion of a hydrophobic liquid in water, bringing two mutually insoluble liquids, such as oil and water, in close contact. They are usually stabilized by an emulsifying agent that inhibits the coalescence of the dispersed liquid. For example, milk is an emulsion of butterfat in water, with the protein casein serving as the emulsifying agent.