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Glen Canyon Dam

(Encyclopedia)Glen Canyon Dam, 710 ft (216 m) high, 1,560 ft (475 m) long, NE Ariz., on the Colorado River. The key unit of the U.S. Bureau of Reclamation's Colorado River storage project, it is one of the world's ...

degree-day

(Encyclopedia)degree-day, a unit of measure used to estimate the fuel and power requirements in heating and cooling a building; it is equal to a difference of 1 degree between the outdoor daily average temperature ...

Grand Coulee Dam

(Encyclopedia)Grand Coulee Dam ko͞oˈlē [key], 550 ft (168 m) high and 4,173 ft (1,272 m) long, on the Columbia ...

Fourier, Charles

(Encyclopedia)Fourier, Charles shärl fo͞oryāˈ [key], 1772–1837, French social philosopher. From a bourgeois family, he condemned existing institutions and evolved a kind of utopian socialism. In Théorie des ...

Hoover Dam

(Encyclopedia)Hoover Dam, 726 ft (221 m) high and 1,244 ft (379 m) long, on the Colorado River between Nev. and Ariz.; one of the world's largest dams. Built between 1931 and 1936 by the U.S. Bureau of Reclamation,...

Brenner, Sydney

(Encyclopedia)Brenner, Sydney, 1927–2019, British molecular biologist, Ph.D. Oxford, 1954. He was director of the MRC Laboratory of Molecular Biology in Cambridge, England (1979–86), and director of the MRC Mol...

Waldheim, Kurt

(Encyclopedia)Waldheim, Kurt ko͝ort vältˈhīm [key], 1918–2007, Austrian diplomat, secretary-general of the United Nations (1972–81) and president of Austria (1986–92). He entered diplomatic service after ...

aircraft carrier

(Encyclopedia)aircraft carrier, ship designed to carry aircraft and to permit takeoff and landing of planes. The carrier's distinctive features are a upper deck (flight deck) that is flat and sometimes sloped to fu...

collective farm

(Encyclopedia)collective farm, an agricultural production unit including a number of farm households or villages working together under state control. The description of the collective farm has varied with time and...

formula, in chemistry

(Encyclopedia)formula, in chemistry, an expression showing the chemical composition of a compound. Formulas of compounds are used in writing the equations (see chemical equations) that represent chemical reactions....