Aerosol Spray Cans
Spray cans produce an aerosol, the technical term for a very fine spray.
They do this by means of a pressurized propellant, which is a liquid that boils
at everyday temperatures. Inside the can, a layer of gaseous pressure increased,
and eventually it becomes so high that boiling stops. when the nozzle is pressed,
the gas pressure forces the product up the tube in the can and out of the nozzle
in a spray or foam. The propellant may emerge as well but, now under less
pressure, it immediately evaporates.
First patented in the US in 1941, aerosol spray cans have been used as
convenient packages for an ever increasing range of products including paints,
insecticides, and shaving cream to name a few. The can is filled with the
product to be sprayed and the propellant, a compressed gas such as butane or
Freon. The gas is partly liquefied by the pressure in the can, but there is a
layer of free gas above the liquid. As the can empties liquefied gas vaporizes
to fill......
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