What type of substance is best referred to as an aerosol?

• A. A liquid in a bottle
• B. A gas in a canister
• C. A suspension of particles in gas
• D. A solid structure

Answer: (C)

An aerosol is best defined as a suspension of tiny solid or liquid particles dispersed in a gas, most commonly air. This definition encompasses products like sprays and mists that consist of microscopic droplets or particles suspended within a gaseous medium. This characteristic makes aerosols distinct from other states of matter and products.

Understanding this helps clarify why the other options do not fit. A liquid in a bottle does not represent the dispersed state needed for an aerosol, as it implies a contained liquid rather than a suspension within a gas. Similarly, a gas in a canister does not involve particles suspended within that gas, which is crucial for the definition of aerosols. Lastly, a solid structure is not applicable because aerosols must involve a combination of matter states, specifically the dispersion of liquid or solid in a gaseous medium. Therefore, the correct identification of aerosols as a suspension of particles in gas is foundational to understanding their properties and applications.