An Aerosol has several definitions and can mean one of the following definitions:

1. Small droplets or particles suspended in the atmosphere, typically containing sulfur. They are usually emitted naturally (e.g. in volcanic eruptions) and as the result of anthropogenic (human) activities such as burning fossil fuels.

2. The pressurized gas used to propel substances out of a container.

Other definition:
An Aerosol is a finely divided material suspended in air or other gaseous environment.

see also:
"Aerosol" is in the UNSPSC Code "41121602"
Aerosol barrier pipette tips

"Aerosol" is in the NAICS Code "332919"
Other Metal Valve and Pipe Fitting Manufacturing
Aerosol valves manufacturing

Other definition:
An aerosol is a suspension of small liquid or solid particles in gas.

Other definition:
An Aerosol is Particulate matter, solid or liquid, larger than a molecule but small enough to remain suspended in the atmosphere. Natural sources include salt particles from sea spray, dust and clay particles as a result of weathering of rocks, both of which are carried upward by the wind. Aerosols can also originate as a result of human activities and are often considered pollutants. Aerosols are important in the atmosphere as nuclei for the condensation of water droplets and ice crystals, as participants in various chemical cycles, and as absorbers and scatters of solar radiation, thereby influencing the radiation budget of the Earth's climate system. See climate, particulate matter, sulfate Aerosols.