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pyrotechnicsThe Columbia Encyclopedia. Copyright © 2001-09 Columbia University Press. All rights reserved.
- ammonium nitrate
Ammonium nitrate, chemical compound, NH4NO3, that exists as colorless, rhombohedral crystals at room temperature but changes to monoclinic crystals when heated above 32°C. It is extremely solu...
- Del Tredici, David
Del Tredici, David, 1937–, American composer, b. Cloverdale, Calif. Originally a pianist, he made his debut with the San Francisco Symphony at 16, and studied composition with Darius Milhaud (...
- Saint Gall, canton, Switzerland
Saint Gall, Ger. Sankt Gallen, canton (1993 pop. 432,800), 777 sq mi (2,012 sq km), NE Switzerland. Bordering on Lake Constance in the north and on the Rhine River in the east, it surrounds th...
- barium
Barium [Gr.,=heavy], metallic chemical element; symbol Ba; at. no. 56; at. wt. 137.33; m.p. 725°C; b.p. 1,640°C; sp. gr. 3.5 at 20°C; valence +2. Barium is a soft, silver-white, chemically act...
- Hunan
Hunan [south of the lake], province (1994 est. pop. 63,050,500), c.80,000 sq mi (207,254 sq km), S central China, S of Dongting lake. Changsha is the capital. Largely hilly in the south and we...
- arsenic
Arsenic, a semimetallic chemical element; symbol As; at. no. 33; at. wt. 74.9216; m.p. 817°C (at 28 atmospheres pressure); sublimation point 613°C; sp. gr. (stable form) 5.73; valence -3, 0, +...
- lithium
Lithium [Gr.,=stone], metallic chemical element; symbol Li; at. no. 3; at. wt. 6.941; m.p. about 180.54°C; b.p. about 1,342°C; sp. gr. .534 at 20°C; valence +1. Lithium is a soft, silver-white...
- strontium
Strontium [from Strontian, a Scottish town], a metallic chemical element; symbol Sr; at. no. 38; at. wt. 87.62; m.p. 769°C; b.p. 1,384°C; sp. gr. 2.6 at 20°C; valence +2. Strontium is a soft, ...
- magnesium
Magnesium, metallic chemical element; symbol Mg; at. no. 12; at. wt. 24.305; m.p. about 648.8°C; b.p. about 1,090°C; sp. gr. 1.738 at 20°C; valence +2. In 1808, Sir Humphry Davy discovered mag...
