Tuesday, May 29, 2012

How does an Aerosol Spray Work?

            Aerosols were patented in the United States of America in 1914 and have been increasingly used since the early 1950s. Aerosol cans and bottles are used to spray paints, perfumes, deodorants, furniture polish, oven cleaner, pesticides and many other liquid products. There is hardly any liquid, which does not come in an aerosol container. Do you know how the aerosol works?

The Functioning of Aerosol Spray

            Initially, the can is filled with the liquid to be sprayed and the propellant. On pushing the press button, the product is force dup the dip tube and comes out as spray from the hole at the top. The top hole is very narrow and causes the liquid to break up into a fine, mist-like spray.

            Inside the can, the propellant is a gas under pressure. The gas is usually a chlorofluorocarbon CFC, which forces the liquid in the tube out of the nozzle at the top. The top of the can contains a valve with a spring that closes the valve when the top is released by means of the press button.

            However, chlorofluorocarbons are very damaging to the atmospheric ozone layer. This has forced scientists to look for alternatives.

            As an aerosol contains a gas under pressure, it is dangerous to puncture or heat the can. If heated, there are possibilities that the can may explode.

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