fused alumina

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• aluminum processing — Introduction       preparation of the ore for use in various products.       Aluminum, or aluminium (Al), is a silvery white metal with a melting point of 660° C (1,220° F) and a density of 2.7 grams per cubic centimetre. The most abundant… …   Universalium

• mohs' scale — ˈmōz , ōs(ə̇z) noun Usage: usually capitalized M Etymology: after Friedrich Mohs died 1839 German mineralogist 1. : a scale of hardness for minerals ranging from 1 for the softest to 10 for the hardest in which 1 represents the hardness of talc;… …   Useful english dictionary

• aluminum — aluminic /al yeuh min ik/, adj. /euh looh meuh neuhm/, n. 1. Chem. a silver white metallic element, light in weight, ductile, malleable, and not readily corroded or tarnished, occurring combined in nature in igneous rock, shale, clay, and most… …   Universalium

• Gas-discharge lamp — See also: Gas filled tube Germicidal lamps are simple low pressure mercury vapor discharges in a fused quartz envelope. Gas discharge lamps are a family of artificial light sources that generate light by sending an electrical discharge through an …   Wikipedia

• Acheson, Edward Goodrich — born March 9, 1856, Washington, Pa., U.S. died July 6, 1931, New York, N.Y. U.S. inventor. He helped develop the incandescent lamp and in 1881 installed the first electric lights for Thomas Alva Edison in Italy, Belgium, and France. Attempting to …   Universalium

• alundum — noun alumina, especially a product made from fused alumina …   Wiktionary

• alundum — noun a substance made of fused alumina (Freq. 1) • Hypernyms: ↑alumina, ↑aluminum oxide, ↑aluminium oxide …   Useful english dictionary

• High-intensity discharge lamp — A High intensity discharge (HID) lamp is a type of electrical lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina tube. This tube is filled… …   Wikipedia

• firebrick — /fuyeur brik /, n. a brick made of fire clay. [1785 95; FIRE + BRICK] * * * ▪ building material also called  Refractory Brick,         refractory material consisting of nonmetallic minerals formed in a variety of shapes for use at high… …   Universalium

• scale — 1. A standardized test for measuring psychological, personality, or behavioral characteristics. SEE ALSO: score, test. 2. SYN: squama. 3. A small thin plate of horny epithelium, resembling a fish s., cast off from the skin …   Medical dictionary

• Mohs' scale — mōz , mōs , mō səz n 1) a scale of hardness for minerals in which 1 represents the hardness of talc; 2, gypsum; 3, calcite; 4, fluorite; 5, apatite; 6, orthoclase; 7, quartz; 8, topaz; 9, corundum; and 10, diamond 2) a revised and expanded… …   Medical dictionary