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Chlorofluorocarbons (CFCs)
Beginning of essay
CFCs are a family of man-made gases used for various industrial
purposes. First developed in the 1920's in the United States, CFCs have
been used in large quantaties since 1950. The industrialized countries can
account for over 80% of CFCs use. CFC-11 is used primarily as a propellant
in aerosol ....
Middle of essay
....react chemically with other materials, and as a result they remain
in the atmosphere for a very long time -- often 50 to 100 years -- before
they are destroyed by reactions catalyzed by the sunlight. CFCs are
composed of carbon, chlorine, and fluorine. Together with other
manufactured gases that contain either fluorine or chlorine, and with
bromine-containg Halons, CFC's are referred to collectively as halogenated
compounds, or halocarbons.
There is an often significant lag time between the p.... |
| Number of words: 697 |
Approximate pages: 3 |
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