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common-ion effect

(Encyclopedia)common-ion effect, decrease in solubility of an ionic salt, i.e., one that dissociates in solution into its ions, caused by the presence in solution of another solute that contains one of the same ion...

convection

(Encyclopedia)convection, mode of heat transfer in fluids (liquids and gases). Convection depends on the fact that, in general, fluids expand when heated and thus undergo a decrease in density (since a given volume...

General Agreement on Tariffs and Trade

(Encyclopedia)General Agreement on Tariffs and Trade (GATT), former specialized agency of the United Nations. It was established in 1948 as an interim measure pending the creation of the International Trade Organiz...

Graves, Robert Ranke

(Encyclopedia)Graves, Robert Ranke, 1895–1985, English poet, novelist, and critic; son of Alfred Percival Graves. He established his reputation with Good-bye to All That (1929), an outspoken book on his war exper...

poison ivy

(Encyclopedia)poison ivy, poison oak, and poison sumac, woody vines and trailing or erect shrubs of the family Anacardiaceae (sumac family), native to North America. They are sometimes considered as several specie...

primary

(Encyclopedia)primary, in the United States, a preliminary election in which the candidate of a party is nominated directly by the voters. The establishment of the primary system resulted from the demand to elimina...

dualism

(Encyclopedia)dualism, any philosophical system that seeks to explain all phenomena in terms of two distinct and irreducible principles. It is opposed to monism and pluralism. In Plato's philosophy there is an ulti...

echo sounder

(Encyclopedia)echo sounder, an older instrumentation system for indirectly determining ocean floor depth. Echo sounding is based on the principle that water is an excellent medium for the transmission of sound wave...

elevator, in machinery

(Encyclopedia)elevator, in machinery, device for transporting people or goods from one level to another. The term is applied to the enclosed structures as well as the open platforms used to provide vertical transpo...

Sture

(Encyclopedia)Sture stüˈrə [key], noble family that played a leading role in Sweden in the 15th and 16th cent. Sten Sture, the elder, c.1440–1503, was chosen regent in 1470. In the battle of Brunkeberg (1471) ...