Aerosol is an is a colloid of fine solid particles or liquid droplets, in air or another gas.

Examples of aerosols include haze, dust, toxins, particulate air pollutants and smoke.

The liquid or solid particles have diameter mostly smaller than 1 μm or so; larger particles with a significant settling speed make the mixture a suspension, but the distinction is not clear-cut.

In general conversation,aerosol usually refers to an aerosol spray that delivers a consumer product from a can or similar container.

Other technological applications of aerosols include dispersal of pesticides, infectious bacterias, medical treatment of respiratory illnesses, and combustion technology.

Aerosol science covers generation and removal of aerosols, technological application of aerosols, effects of on the environment and people, and a wide variety of other topics.

The science of Aerosol also covers the field of designing weapons that are used in biological warfare or Aerosolization.