Search results
Results From The WOW.Com Content Network
Perfluorocyclohexane is chemically inert and thermally stable. It is a relatively non-toxic, clear, waxy solid, which has a high vapor pressure and therefore sublimes readily at room temperature. [citation needed] The molecule predominantly exists in its chair conformation, in which it possesses D 3d molecular symmetry.
Perfluorohexane (C 6 F 14), or tetradecafluorohexane, is a fluorocarbon.It is a derivative of hexane in which all the hydrogen atoms are replaced by fluorine atoms. It is used in one formulation of the electronic cooling liquid/insulator Fluorinert for low-temperature applications due to its low boiling point of 56 °C and freezing point of −90 °C.
A 2018 report to Congress indicated that "at least 126 drinking water systems on or near military bases" were contaminated with PFAS compounds. [8] [9] A 2016 study found unsafe [10] levels of fluorosurfactants in 194 out of 4,864 water supplies in 33 U.S. states. Covering two-thirds of drinking water supplies in the United States, the study ...
Perfluoroalkanes are very stable because of the strength of the carbon–fluorine bond, one of the strongest in organic chemistry. [4] Its strength is a result of the electronegativity of fluorine imparting partial ionic character through partial charges on the carbon and fluorine atoms, which shorten and strengthen the bond (compared to carbon-hydrogen bonds) through favorable covalent ...
Date/Time Thumbnail Dimensions User Comment; current: 09:01, 4 January 2010: 952 × 1,431, 18 pages (4.8 MB): Ayacop {{Information |Description={{en|1=original paper resulting in Henry's law, one of the gas laws}} |Source=William Henry: ''Experiments on the Quantity of Gases Absorbed by Water, at Different Temperatures, and under Different Pressures'' Phil. Trans. R.
By the 1970s, 3M was aware of the environmental dangers of PFAs [citation needed] and began their "Pollution Prevention Pays", preventing over 2.5 million tons of waste from entering landfills. Since then, 3M has continued to use PFAs in a variety of products, with Scotchgard being the most well known and commercially lucrative. [ 4 ]
Satellite image of Hinkley, Barstow and Harper Lake, California. From 1952 to 1966, Pacific Gas and Electric Company (PG&E) dumped about 370 million U.S. gallons (1.4 × 10 9 liters) of chromium-tainted wastewater into unlined wastewater spreading ponds around the town of Hinkley, California, located in the Mojave Desert about 120 miles (190 kilometers) north-northeast of Los Angeles.
Air pollution — Atmospheric particulate matter • Biological effects of UV exposure • CFC • Environmental impact of the coal industry • Environmental impact of hydraulic fracturing • Indoor air quality • Ozone depletion • Smog • Tropospheric ozone • Volatile organic compound • Ultrafine particles Light pollution Noise pollution