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An aerosol is a collection of microscopic particles, solid or liquid, suspended in a gas. In the context of air pollution, an aersol refers to fine particulate matter, that is larger than a molecule, but small enough to remain suspended in the atmosphere for at least several hours. The term aerosol is also commonly used for a pressurized container (aerosol can) which is designed to release a fine spray of a material such as paint. It has also come to be associated, erroneously, with the gas (propellant) used to expel materials from an aerosol can. Natural sources of aerosols include salt particles from sea spray, dust and clay particles from the weathering of rocks. Aerosols can also originate as a result of human activities and are often considered pollutants. Aerosols play an important role in the atmosphere namely in the condensation of water droplets and ice crystals, various chemical cycles, and the absorption of solar radiation. Details... Aerosol technically refers to airborne solid particles (also called dust or particulate matter (PM)) or liquid droplets. In casual language, aerosol refers to an aerosol spray can or the output of such a can. The term aerosol, derives from the fact that matter "floating" in air is a suspension (a mixture in which solid or liquid or combined solid-liquid particles are suspended in a fluid). To differentiate suspensions from true solutions, the term sol evolved-originally meant to cover dispersions of tiny (sub-microscopic) particles in a liquid. With studies of dispersions in air, the term aerosol evolved and now embraces both liquid droplets, solid particles, and combinations of these. An aerosol can come from a volcano or an aerosol can.
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