Impervious Fumes are very small, airborne, solid particles formed by the cooling of a hot vapor For example, a hot zinc vapor may form when zinc-coated steel is welded The vapor then condenses to form fine zinc fumes as soon as it contacts the cool surrounding air Fumes are smaller than dusts and are more easily breathed into the lungs
Toxic and/or corrosive airborne chemicals from reagents that are typically in liquid or solid state in the form of either gases or small particles (mist)