Final answer:
A medicine that is a mixture of oil suspended in a fluid is called an emulsion. Emulsions consist of droplets dispersed in another liquid, stabilized by emulsifying agents to prevent separation.
Step-by-step explanation:
When a medicine is a preparation of oil suspended in fluid, it is known as an emulsion.
An emulsion is created when two immiscible liquids, such as oil and water, are blended together. The oil is broken down into droplets of colloidal size, dispersing throughout the water. These mixtures are stable when aided by an emulsifying agent that prevents the oil droplets from coalescing and separating out.
Emulsions differ from suspensions, which are cloudy, heterogeneous mixtures where large particles can settle out over time, and solutions, which are homogeneous mixtures where the dissolved species do not settle. Examples of everyday emulsions include mayonnaise and milk, which contain components like egg yolk and casein, respectively, which act as emulsifying agents.