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cresol

(Encyclopedia)cresol krēˈsōl [key], CH3C6H4OH, any one of three aromatic alcohols present in coal tar. The three compounds are structural isomers; they may be thought of as hydroxy derivatives of toluene or as m...

photocopying

(Encyclopedia)photocopying, process whereby written or printed matter is directly copied by photographic techniques. Generally, photocopying is practical when just a few copies of an original are needed. When many ...

Dead Sea

(Encyclopedia)Dead Sea, salt lake, c.390 sq mi (1,010 sq km), extending c.45 mi (70 km) in the Jordan trough of the Great Rift Valley between the Ghor on the north and Wadi Arabah on the south, on the border betwee...

Calvin, Melvin

(Encyclopedia)Calvin, Melvin, 1911–97, American organic chemist and educator, b. St. Paul, Minn., grad. Michigan College of Mining and Technology, 1931, Ph.D. Univ. of Minnesota, 1935. In 1937 he joined the facul...

Cornforth, Sir John Warcup

(Encyclopedia)Cornforth, Sir John Warcup wôrˈkəp côrnˈfərth [key], 1917–2013, Australian chemist, Ph.D. Oxford, 1941. Although Cornforth suffered a hearing loss from childhood and was deaf by the time he gr...

Prince Edward Island National Park

(Encyclopedia)Prince Edward Island National Park, 7 sq mi (18 sq km), NW P.E.I., Canada, on the Gulf of St. Lawrence; est. 1937. It extends 25 mi (40 km) along the coast and contains sand dunes, cliffs, salt marshe...

Bountiful

(Encyclopedia)Bountiful, city (2020 pop. 43,893), Davis co., N central Utah; inc. 1892. It is a residential suburb N of Salt Lake City with some farming and floral nu...

Margarita

(Encyclopedia)Margarita märgärēˈtä [key], island, 444 sq mi (1,150 sq km), in the Caribbean Sea off the coast of Venezuela. With many smaller islands it constitutes the Venezuelan state of Nueva Esparta (1990 ...

precipitation, in chemistry

(Encyclopedia)precipitation, in chemistry, a process in which a solid is separated from a suspension, sol, or solution. In a suspension such as sand in water the solid spontaneously precipitates (settles out) on st...

Ndjamena

(Encyclopedia)Ndjamena fôr-lämēˈ [key], city (1993 urban pop. 213,342), capital of Chad and of Chari-Baguirmi prefecture, SW Chad. It is a port on the Chari River and a transportation hub that lies on roads lea...