Aerosols are a type of dispersion in which fine particles are suspended in a gaseous carrier medium. These particles can consist of a variety of materials, such as solid particles, liquids or gases. The size of the particles in an aerosol determines how it is used and how it behaves in the environment.

One of the main advantages of aerosols is their ability to be used as sprays. They allow for even distribution of materials that would otherwise be difficult to handle or apply. They are often sold in cans that contain a sprayable carrier medium, a propellant and a special nozzle that ensures even distribution of the contents.