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Subjects>Science>Chemistry

What is freon-12?

Updated: 9/14/2023

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∙ 15y ago

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Dichlorodifluoromethane (R-12), usually sold under the DuPont brand name Freon-12, is a chlorofluorocarbon halomethane, commonly known as CFC, used as a refrigerant and aerosol spray propellant. Its manufacture was banned in the United States and many countries in 1994 over concerns about damage that such compounds might do to the ozone layer if released into the atmosphere.

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What is the melting point and boiling point of ammonia gas?

Good question. At sea level pressure (14.7psia), ammonia boils at -28degrees F or approximately -33degreesC. Under considerably greater pressure, it is a liquid even at room temperature. Because it can be readily compressed into a liquid at room temperature and well beyond, it becameTHE refrigerant of choice in the early days of mechanical refrigeration and air-conditioning. However, its toxic nature made it dangerous/unsuitable to use in home refrigeration, and absolutely unsuitable for use in car air conditioning. When DuPont invented dichlorodifluoromethane, or "Freon12" in the 1940s, with a P-T liquification curve similar to that of ammonia, ammonia was quickly displaced in many/most applications in favor of "Freon12" and car air conditioning came into being. However, even to this day ammonia is still used as a refrigerant in some industrial applications, such as ice houses, due to its cheap price, and it poses no threat to the overall environment.

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