Fumes are defined as which of the following?

Fumes are defined as which of the following?

• A. Particles made of vapor, dust or smoke emitted by a substance due to heating, explosion or chemical reaction
• B. Gaseous emissions from water vapor
• C. Fine moisture particles produced by humid air
• D. Solid particles created by mechanical grinding

Answer: (A)

Fumes are tiny solid particles that form when a substance is heated or subjected to a chemical reaction enough to vaporize some of it, and those vapors then condense into fine particles that float in the air. The best description captures this idea by referring to particles emitted due to heating, an explosion, or a chemical reaction, since those processes cause vaporization and subsequent condensation into airborne particles. This differs from gases like water vapor (which is invisible), from moisture droplets produced by humidity (mist), or from solid particles created by grinding (dust), none of which describe the vaporization-condensation process that defines fumes.

Fumes are tiny solid particles that form when a substance is heated or subjected to a chemical reaction enough to vaporize some of it, and those vapors then condense into fine particles that float in the air. The best description captures this idea by referring to particles emitted due to heating, an explosion, or a chemical reaction, since those processes cause vaporization and subsequent condensation into airborne particles. This differs from gases like water vapor (which is invisible), from moisture droplets produced by humidity (mist), or from solid particles created by grinding (dust), none of which describe the vaporization-condensation process that defines fumes.