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smog

(Encyclopedia) smog smg [smoke+fog], dense, visible air pollution. Smog is commonly of two types. The gray smog of older industrial cities like London and New York derives from the massive…

Palomar Mountain

(Encyclopedia) Palomar Mountain pl´mär, peak, 6,126 ft (1,867 m) high, S Calif., NE of San Diego, in Cleveland National Forest. It is the site of the Palomar Observatory, operated by the California…

air pollution

(Encyclopedia) air pollution, contamination of the air by noxious gases and minute particles of solid and liquid matter (particulates) in concentrations that endanger health. The major sources of air…

November 2018 Current Events: World News

Top of Page US News | Science & Technology News | Disaster News The world is a very busy place, and it's hard to stay on top of everything. Infoplease has got you covered. Here are the world…

nitric oxide

(Encyclopedia) nitric oxide or nitrogen monoxide, a colorless gas formed by the combustion of nitrogen and oxygen as given by the reaction: energy + N2 + O2 2NO; m.p. 163.6&degC;; b.p. 151.8…

temperature inversion

(Encyclopedia) temperature inversion, condition in which the temperature of the atmosphere increases with altitude in contrast to the normal decrease with altitude. When temperature inversion occurs…

2017 Year in Review - World News

  Top events for the nation and the world in 2017 Prev Next Smog Alert China and India Face Pollution Issues On January 13, China issued its first-ever nationwide red alert for smog. A…

Glossary of Chemical Terms - S

SA B C D E F G H I J K L M N O P Q R S T U V W X Y Z saccharin A compound, C7H5NO3S, that is several hundred times sweeter than can sugar and is used as a calorie-free sweetener. salt An ionic…

diesel engine

(Encyclopedia) diesel engine, type of internal-combustion engine invented by the German engineer Rudolf Diesel and patented by him in 1892. Although his engine was designed to use coal dust as fuel,…