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galvanizing
galvanizing process of coating a metal, usually iron or steel, with a protective covering of zinc. Galvanized iron is prepared either by dipping iron, from which rust has been removed by the action of sulfuric acid, into molten zinc so that a thin layer of the zinc remains on the surface of the iro...
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Georg Simon Ohm
Georg Simon Ohm , 1787-1854, German physicist. He was professor at Munich from 1852. His study of electric current led to his formulation of the law now known as Ohm's law . The unit of electrical resistance (see ohm ) was named for him. He also made studies in acoustics and in crystal interferenc...
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corrosion
corrosion atmospheric oxidation of metals (see oxidation and reduction ). By far the most important form of corrosion is the rusting of iron . Rusting is essentially a process of oxidation in which iron combines with water and oxygen to form rust, the reddish-brown crust that forms on the surface...
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zinc
zinc metallic chemical element; symbol Zn; at. no. 30; at. wt. 65.38; m.p. 419.58°C; b.p. 907°C; sp. gr. 7.133 at 25°C; valence +2. Zinc is a lustrous bluish-white metal. It is found in Group 12 of the periodic table . It is brittle and crystalline at ordinary temperatures, but when he...
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sandblast
sandblast stream of sand or other abrasive particles driven by a jet of compressed air or water or by centrifugal force against a surface to clean or abrade it. When centrifugal force is used, the abrasives are whirled in a rapidly rotating device before being directed against the surface. Powder...
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William Hyde Wollaston
William Hyde Wollaston 1766-1828, English scientist, M.D. Cambridge, 1793. His wide-ranging scientific achievements include the discovery (1802) of the dark lines (Fraunhofer lines) in the solar spectrum; invention of the reflecting goniometer (an instrument by which the angles of crystals are meas...
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World Trade Center
World Trade Center former building complex in lower Manhattan, New York City, consisting of seven buildings and a shopping concourse on a 16-acre (6.5-hectare) site; it was destroyed by a terrorist attack on Sept. 11, 2001. Prior to its destruction, the World Trade Center had been the world's large...
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Abbé Pierre
Abbé Pierre , 1912-2007, French priest and social activist, b. Lyons as Henri Antoine Grouès. Renouncing a wealthy inheritance to become a Capuchin monk in 1931, he left the monastery and was ordained a priest in 1938. He served (1939-40) in the French army during World War II and was ...
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homosexuality
homosexuality a term created by 19th cent. theorists to describe a sexual and emotional interest in members of one's own sex. Today a person is often said to have a homosexual or a heterosexual orientation, a description intended to defuse some of the long-standing sentiment among many Westerners t...
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Organization for Security and Cooperation in Europe
Organization for Security and Cooperation in Europe (OSCE), international organization established as the Conference on Security and Cooperation in Europe (CSCE) in 1973, during the cold war , to promote East-West cooperation. Headquarters are in Prague, Czech Republic. The CSCE's 1975 meeting in ...
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