the.com/aerosol

means A fine mist of tiny liquid or solid particles suspended in a gas — think spray cans, fog, and smoke.

from Built in the early 20th century from Greek 'aer' (air) plus 'sol', clipped from 'solution' — the same root seen in 'colloid' chemistry. Scientists needed a word for particles dispersed in air the way a solute disperses in a liquid, so they simply borrowed the logic of 'hydrosol' (particles suspended in water) and swapped in air. The word stayed mostly in physics and chemistry journals until the pressurized spray can made it a household item, and a household word, by the mid-1900s.