What is Aerosol spray?
[[File:Aerosol.png|thumb|right|An activated aerosol spray]] '''Aerosol spray''' is a system used in certain [[container]]s, like spray [[Cylinder|cans]]. The contents of the can, like [[color]] or [[deodorant]] are [[pressure|pressurized]]. The can has a [[valve]]. When this valve is opened, the liquid is forced out. It will emerge as an [[aerosol]] or [[mist]]. Apart from the liquid, there is another substance in the container, usually called [[propellant]]. When the valve is opened, some propellant will be forced inside the container. That way the pressure in the container is kept constant. == History == [[File:Montana Gold Can.jpg|thumb|right|An aerosol can disassembled]] Around 1790, it was discovered that a [[Carbonation|carbonated]] [[Drink|beverage]] was pushed out of a container in [[France]]. In 1837, the [[syphon]] was invented. In 1862, several experiments with [[liquid]] spraying using compressed gas were held. In 1927, [[Norway|Norwegian]] [[engineer]] Eric Rotheim proposed the first usable [[aerosol]] balloon construction. In 1943, Americans Lyle Goodhugh and William Sullivan, commissioned by the US government, developed a ''bug bomb'' (World War II was going on, and it was necessary to find a way to quickly spray [[insecticide]] in order to control insect-borne diseases). This date is considered to be the beginning of the mass production of aerosol balloons. In 1947, aerosolized insecticides appeared on the mass market. In 1949, Robert Abplanalp invented the modern spray [[valve]]. In the same year, Edward Seymour started the production of spray paint. == Safety == The instructions for most aerosols warn that it is forbidden to spray it near open [[Flame|flames]], [[Electric stove|electric stoves]], and so on. It is also forbidden to overheat balloons and put them in the sun in hot weather, as well as on heaters. There were many cases of balloon [[Explosion|explosions]] in hot weather, as well as [[Pyrotechnics|pyrotechnic]] entertainment of [[Detonation|detonating]] aerosols on fires, whi