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North West
(Encyclopedia)North West, province (2011 pop. 3,509,953), 40,495 sq mi (104,882 sq km), N central South Africa. In 1994, under South Africa's post-apartheid constitution, North West was created from parts of the fo...Penn, Irving
(Encyclopedia)Penn, Irving, 1917–2009, American photographer, elder brother of Arthur Penn, b. Plainfield, N.J.; studied Philadelphia Museum School of Industrial Art (now University of the Arts, 1934–38). Origi...Cartagena, city, Colombia
(Encyclopedia)Cartagena kärtähāˈnä [key], city, capital of Bolívar dept., NW Colombia, a port on the ...Capra, Frank
(Encyclopedia)Capra, Frank kăpˈrə [key], 1897–1991, American film director, b. Bisaquino, Sicily. One of the preeminent Hollywood directors of the 1930s and 40s, he produced idealistic populist movies that, so...electromotive series
(Encyclopedia)electromotive series, list of metals whose order indicates the relative tendency to be oxidized, or to give up electrons (see oxidation and reduction); the list also includes the gas hydrogen. The ele...aqua regia
(Encyclopedia)aqua regia rēˈjēə [key] [Lat.,=royal water], corrosive, fuming yellow liquid prepared by mixing one volume of concentrated nitric acid with three to four volumes of concentrated hydrochloric acid....gold
(Encyclopedia)gold, metallic chemical element; symbol Au [Lat. aurum=shining dawn]; at. no. 79; at. wt. 196.96657; m.p. 1,064.43℃; b.p. 2,808℃; sp. gr. 19.32 at 20℃; valence +1 or +3. Gold is very ductile and...fuel cell
(Encyclopedia)fuel cell, electric cell in which the chemical energy from the oxidation of a gas fuel is converted directly to electrical energy in a continuous process (see oxidation and reduction). The efficiency ...mineral
(Encyclopedia)mineral, inorganic substance occurring in nature, having a characteristic and homogeneous chemical composition, definite physical properties, and, usually, a definite crystalline form. A few of the mi...Browse by Subject
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