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compressed air
(Encyclopedia) compressed air, air whose volume has been decreased by the application of pressure. Air is compressed by various devices, including the simple hand pump and the reciprocating, rotary,…galvanizing
(Encyclopedia) 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…Benét, William Rose
(Encyclopedia) Benét, William Rose, 1886–1950, American poet and editor, b. Brooklyn, grad. Yale, 1907; brother of Stephen Vincent Benét. He was associated as editor or assistant editor with the…silicosis
(Encyclopedia) silicosissilicosissĭlĭkōˈsĭs [key], occupational disease of the lungs caused by inhalation of free silica (quartz) dust over a prolonged period of time. Free silica is dispersed in the…stellar populations
(Encyclopedia) stellar populations, two broadly contrasting distributions of star types that are characteristic of different parts of a galaxy. Population I stars are young, recently formed stars,…Milky Way
(Encyclopedia) CE5 Position of the sun in the Milky Way Milky Way, the galaxy of which the sun and solar system are a part, seen as a broad band of light arching across the night sky from horizon…gegenschein
(Encyclopedia) gegenscheingegenscheingāˈgənshīnˌ [key] or counterglow, a slight brightening of the night sky in the region of the zodiac directly opposite the sun, i.e., 180° from the sun. Discovered…abrasive
(Encyclopedia) abrasive, material used to grind, smooth, cut, or polish another substance. Natural abrasives include sand, pumice, corundum, and ground quartz. Carborundum (silicon carbide) and…rosin
(Encyclopedia) rosin or colophony, hard, brittle, translucent resin, obtained as a solid residue from crude turpentine. Usually pale yellow or amber, its color may vary from brownish-black to…Q fever
(Encyclopedia) Q fever, disease caused by Coxiella burnetii, a small, Gram-negative bacterium. The bacterium infects livestock (cattle, goats, and sheep) and other domesticated animals, and is found…Trending
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