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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...

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...

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...

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 ...

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...

Hofu

(Encyclopedia)Hofu hōˈfo͞o [key], city, Yamaguchi prefecture, SW Honshu, Japan, on the Suo Sea. It is a ...

germicide

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

Orekhovo-Zuyevo

(Encyclopedia)Orekhovo-Zuyevo əryĕˈkhəvə-zo͞oˈyĭvə [key], city (1989 pop. 137,000), W central European Russia, on the Klyazma River. There is a large textile industry (dating from the 18th cent.) and a maj...

West Bromwich

(Encyclopedia)West Bromwich brŭmˈĭj, –ĭch, brŏmˈwĭch [key], town, Sandwell borough, W central England. On the site of a 12th-century Benedictine priory, West Bromwich has foundries and engineering and chem...