chlorofluorocarbons
61Global cooling — in general can refer to an overall cooling of the Earth. In this article it refers primarily to a conjecture during the 1970s of imminent cooling of the Earth s surface and atmosphere along with a posited commencement of glaciation. This… …
62Liquefied petroleum gas — (also called LPG, GPL, LP Gas, or liquid propane gas) is a flammable mixture of hydrocarbon gases used as a fuel in heating appliances and vehicles. It is increasingly used as an aerosol propellant and a refrigerant, replacing chlorofluorocarbons …
63Nimbus program — Artist s drawing of the general design of the Nimbus series of satellites. The solar panel wings move throughout the day to track the Sun during the daylight part of the satellite’s orbit. The 10 foot tall satellite has the attitude control… …
64Salbutamol — (S) Salbutamol Systematic (IUPAC) name …
65Thermoelectricity — (thermo electricity) refers to a class of phenomena in which a temperature difference creates an electric potential or an electric potential creates a temperature difference. In modern technical usage, the term almost always refers collectively… …
66Flux (metallurgy) — Rosin used as flux for soldering A flux pen used f …
67One-Tonne Challenge — Logo Energy portal The O …
68Refrigerant — A refrigerant is a compound used in a heat cycle that undergoes a phase change from a gas to a liquid and back. The two main uses of refrigerants are refrigerators/freezers and air conditioners ( cf. coolant). The use of refrigerant has been… …
69Ozone-oxygen cycle — in the ozone layer. The ozone oxygen cycle is the process by which ozone is continually regenerated in Earth s stratosphere, all the while converting ultraviolet radiation into heat. In 1930 Sydney Chapman resolved the chemistry involved. The… …
70Frank Sherwood Rowland — At the inaugural World Science Summit, May 2008 Born June 28, 1927 …
