What does an emulsion consist of?

An emulsion is defined as a mixture where small droplets of one liquid are dispersed throughout another liquid with which it does not mix. This is characterized by the two liquids being immiscible, meaning they do not readily blend together, such as oil and water. The stability of an emulsion is often enhanced by the addition of emulsifiers, which are substances that help to keep the droplets suspended and prevent them from coalescing. This definition aligns directly with the understanding of emulsions in chemistry and their practical applications in fields such as food science, cosmetics, and pharmaceuticals.

The other options describe different types of mixtures. For instance, two immiscible solids do not form an emulsion, as emulsions specifically involve liquids. A uniform mixture of gases refers to a gaseous mixture rather than a liquid system, and suspended solids in a liquid describe a colloidal system rather than an emulsion. Emulsions focus on the interaction and stability of liquid phases, distinguishing them from these other combinations.