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carbon black

(Encyclopedia)carbon black, mixture of partially burned hydrocarbons. Carbon black is produced by partial combustion of natural gas. It is used as a black pigment for inks and paints, and is used in large amounts b...

bleaching powder

(Encyclopedia)bleaching powder, white or nearly white powder that is usually a mixture of calcium chloride hypochlorite, CaCl(OCl); calcium hypochlorite, Ca(OCl)2; and calcium chloride, CaCl2. Sometimes called chlo...

hydrogen

(Encyclopedia)hydrogen hīˈdrəjən [key] [Gr.,=water forming], gaseous chemical element; symbol H; at. no. 1; interval in which at. wt. ranges 1.00784–1.00811; m.p. −259.14℃; b.p. −252.87℃; density 0.08...

Kyzyl Kum

(Encyclopedia)Kyzyl Kum or Kizil Kum both: kəzŭlˈ ko͞om [key] [Turk.,=red sand], desert, c.115,000 sq mi (297,900 sq km), in Kazakhstan and Uzbekistan. This vast region SE of the Aral Sea between the Amu Darya ...

Laghouat

(Encyclopedia)Laghouat lägwätˈ [key], town (1998 pop. 96,342), N Algeria, an oasis on the north edge of the Sahara Desert. It is an important administrative and military center and marketplace and is known for r...

leaven

(Encyclopedia)leaven lĕvˈən [key], agent used to raise bread or other flour foods. Physical leavens include water vapor, which is released as steam at high temperatures (as in popovers), and air, which is incorp...

Arce Catacora, Luis Alberto

(Encyclopedia)Arce Catacora, Luis Alberto, 1963–, Bolivian government official and political leader. Trained as an economist, Arce held several positions at Bolivia's central bank (1987–2006) before becoming mi...

Hobbs

(Encyclopedia)Hobbs, city (2020 pop. 40,508), Lea co., SE N.Mex.; inc. 1929. With the discovery (c.1928) of oil and natural gas in the area, Hobbs became one of the l...

gunboat

(Encyclopedia)gunboat, small warship for use on rivers and along coasts in places inaccessible to vessels of larger displacement. In the U.S. Civil War both sides used as gunboats, on the Mississippi and other rive...

Grand Junction

(Encyclopedia)Grand Junction, city (2020 pop. 65,560), seat of Mesa co., W Colo., at the junction of the Gunnison and Colorado rivers; inc. 1891. The shipping and pro...