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Bromochlorodifluoromethane (BCF), also referred to by the code numbers Halon 1211 and Freon 12B1, is a haloalkane with the chemical formula C F 2 Cl Br. It is used for fire suppression, especially for expensive equipment or items that could be damaged by the residue from other types of extinguishers. [ 1 ]
'Freon' is the brand name for the refrigerants R-12, R-13B1, R-22, R-410A, R-502, and R-503 manufactured by The Chemours Company, and so is not used to label all refrigerants of this type. They emit a strong smell similar to acetone. [2] Freon has been found to cause damage to human health when inhaled in large amounts.
Trichlorofluoromethane, also called freon-11, CFC-11, or R-11, is a chlorofluorocarbon (CFC). It is a colorless, faintly ethereal, and sweetish-smelling liquid that boils around room temperature. [5] CFC-11 is a Class 1 ozone-depleting substance which damages Earth's protective stratospheric ozone layer. [6]
Introduced in 1876. Became a common process during the heady days of gas-lighting from the 1870s to the first decade of the 20th century, especially useful for mixing with coal gas. Process had similar positives and negatives as straight water gas, but also had illuminant value, as well as higher cost, due to oil/tar use.
According to local sources, it was the first in the United States to have electric air conditioning using freon. [24] Ridgeleigh Terrace was the home of his son, Eugene, until his death. Eugene's wife, Virginia, lived in the house for many years, restoring and redecorating it. In the late 1990s, the house largely destroyed in a fire, and was ...
Worldwide production of R-22 in 2008 was about 800 Gg per year, up from about 450 Gg per year in 1998, with most production in developing countries. [2] R-22 use is being phased out in developing countries, where it is largely used for air conditioning applications.
The eight teams seeded Nos. 5-12 will play in a first round with the better seed hosting the lower seeds either on campus or at other sites designated by the higher-seeded institution (No. 12 at ...
The substance made its first appearance around 1965, and increased in level until around 2000. [9] In 2000 Earth's atmosphere contained 0.08 parts per trillion of Freon 112a. [10] Level slightly declined to 0.07 ppt by 2012. [9] Estimated lifetime in the stratosphere is 44 years. [10] By 2014 3,600 tons of Freon 112a had been put into the ...