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hydroxide

(Encyclopedia)hydroxide hīdrŏkˈsīd [key], chemical compound that contains the hydroxyl (−OH) radical. The term refers especially to inorganic compounds. Organic compounds that have the hydroxyl radical as a f...

Dar es Salaam

(Encyclopedia)Dar es Salaam därˈ-ĕs-sälämˈ [key] [Arab.,=haven of peace], city (2021 est. metro area pop. ...

airship

(Encyclopedia)airship, an aircraft that consists of a cigar-shaped gas bag, or envelope, filled with a lighter-than-air gas to provide lift, a propulsion system, a steering mechanism, and a gondola accommodating pa...

Mellon, Andrew William

(Encyclopedia)Mellon, Andrew William, 1855–1937, American financier, industrialist, and public official, b. Pittsburgh. He studied at the Western Univ. of Pennsylvania (now the Univ. of Pittsburgh), but he left c...

diving, springboard and platform

(Encyclopedia)diving, springboard and platform, sport of entering the water from a raised position, often while executing tumbles, twists, and other acrobatic maneuvers. In most dives the upper part of the body ent...

coin

(Encyclopedia)coin, piece of metal, usually a disk of gold, silver, nickel, bronze, copper, aluminum, or a combination of such metals, stamped by authority of a government as a guarantee of its real or exchange val...

barium

(Encyclopedia)barium bârˈēəm [key] [Gr.,=heavy], metallic chemical element; symbol Ba; at. no. 56; at. wt. 137.327; m.p. 725℃; b.p. 1,640℃; sp. gr. 3.5 at 20℃; valence +2. Barium is a soft, silver-white, ...

propeller

(Encyclopedia)propeller, device consisting of a hub with one or more blades that propels a craft to which it is attached by rotating its blades in a fluid such as air or water. In the latter part of the 1830s the S...

Salvador, city, Brazil

(Encyclopedia)Salvador souN [key], city (1991 pop. 2,075,273), capital of Bahia state, E Brazil, a port on the Atlantic Ocean. It is the commercial center of a fertile crescent (the Recôncavo) and a shipping point...

radiator

(Encyclopedia)radiator, device used to heat an area surrounding it or to cool a fluid circulating within it. The familiar radiators of steam and hot water heating systems in buildings are misnamed, as they operate ...