Which statement best describes an emulsion?

• A. A coarse dispersion of small globules of lipid in a vehicle immiscible (ex. Oil in Water)
• B. A gel formed by lipid in water
• C. A homogeneous solution of oil in water
• D. A suspension of solids in a liquid

Answer: (A)

Emulsions are liquid–liquid systems where droplets of one liquid are dispersed in another liquid that does not mix with it. The defining feature is a dispersed phase of droplets within a continuous immiscible phase. A common example is oil droplets dispersed in water, forming an oil-in-water emulsion. This is exactly what the statement describes: a coarse dispersion of small globules of lipid in a vehicle that is immiscible with it. Emulsions are often stabilized by emulsifying agents to prevent droplets from coalescing.

The other descriptions don’t fit because a gel is a semi-solid network, not droplets in a liquid; a homogeneous solution of oil in water would require miscibility, which oil and water lack; and a suspension involves solid particles dispersed in a liquid, not liquid droplets.