chlorofluorocarbons
51List of environmental issues — This is a list of environmental issues that are due to human activity. These articles relate to the anthropogenic effects on the natural environment.*Climate change Global warming • Fossil fuels • Sea level rise • Effects of the automobile on… …
52Beaver Falls, Pennsylvania — Infobox Settlement official name = Beaver Falls, Pennsylvania nicknames = Birthplace of College Basketball motto = imagesize = 250px image caption = View of Beaver Falls, from the borough of New Brighton. image mapsize = 250px map caption =… …
53List of mechanical engineers — This is a list of mechanical engineers, notable people who were trained in or practiced mechanical engineering, nuclear engineering, etc. This is not a list of engineers practicing that profession.See also List of engineers for links to other… …
54Earth's atmosphere — ppmvThe composition figures above are by volume fraction (V%), which for ideal gases is equal to mole fraction (that is, the fraction of total molecules). Although the atmosphere is not an ideal gas, nonetheless the atmosphere behaves enough like …
55Tom DeLay — House Majority Leader In office January 3, 2003 – September 28, 2005 Speaker Dennis Hastert Whip …
56Honeywell — For other uses, see Honeywell (disambiguation). Honeywell International, Inc. Type Public Traded as NYSE:  …
57Freon — is DuPont s trade name for its odorless, colorless, nonflammable, and noncorrosive chlorofluorocarbon and hydrochlorofluorocarbon refrigerants, which are used in air conditioning and refrigeration systems.HistoryFreon was initially developed in… …
58Clair Cameron Patterson — Born June 2, 1922 Mitchellville, Iowa, U.S Died December 5, 1995(1995 12 05) (aged 73) Sea Ranch, California, U.S …
59R-value (insulation) — The R value or R value is a measure of thermal resistance (K·m²/W) [Oak Ridge National Laboratory, [http://www.ornl.gov/sci/roofs+walls/insulation/ins 02.html Which Kind Of Insulation Is Best?] , retrieved 2008 07 13.] used in the building and… …
60Bromochlorodifluoromethane — IUPAC name …
