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Arnold, Frances Hamilton

(Encyclopedia)Arnold, Frances Hamilton, 1956–, American chemical engineer, b. Edgewood, Pa., Ph.D. Univ. of California, Berkeley, 1985. Arnold has been a professor at the California Institute of Technology since ...

hydrogen sulfide

(Encyclopedia)hydrogen sulfide, chemical compound, H2S, a colorless, extremely poisonous gas that has a very disagreeable odor, much like that of rotten eggs. It is slightly soluble in water and is soluble in carbo...

Du Pont, Pete

(Encyclopedia) Du Pont, Pete (Pierre Samuel du Pont IV), 1935-2021, Wilmington, Del, Princeton Univ. (Mech. Engr., 1956); Harvard Law School (J.D., 1963). Du Pont wa...

perfluoroalkyl and polyfluoroalkyl substances

(Encyclopedia)perfluoroalkyl and polyfluoroalkyl substances (PFAS), a group of several thousand synthetic organic chemical compounds made up of a chain of carbon atoms bonded to fluorine atoms. PFAS, which resist w...

polymorphism

(Encyclopedia)polymorphism, of minerals, property of crystallizing in two or more distinct forms. Calcium carbonate is dimorphous (two forms), crystallizing as calcite or aragonite. Titanium dioxide is trimorphous;...

Yashin, Lev Ivanovich

(Encyclopedia)Yashin, Lev Ivanovich, 1929–90, Russian soccer player. A superb goalkeeper, perhaps the best in the history of the game, he was a Soviet sports hero. Yashin spent his playing career (1949–71) with...

Saint Helens

(Encyclopedia)Saint Helens, metropolitan borough (1991 pop. 114,397), NW England, in the Greater Liverpool metropolitan area. It is a major center of glass manufacture in England. The city also has iron and brass f...

Rocky Hill

(Encyclopedia)Rocky Hill, town (1990 pop. 16,554), Hartford co., central Conn., a suburb of Hartford, on the Connecticut River; settled c.1650, inc. 1843. Chemical coatings and synthetic textiles are made there. Ro...

Shimada

(Encyclopedia)Shimada shĭmäˈdä [key], city (1990 pop. 73,810), Shizuoka prefecture, E central Honshu, Japan, on the Oi River. It is a distribution point for timber and rice and a center for woodworking, chemica...

germicide

(Encyclopedia)germicide jûrˈmĭsīd [key], chemical substance capable of killing many different types of microorganisms; also called disinfectant. ...