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mechanics

(Encyclopedia)mechanics, branch of physics concerned with motion and the forces that tend to cause it; it includes study of the mechanical properties of matter, such as density, elasticity, and viscosity. Mechanics...

physics

(Encyclopedia)physics, branch of science traditionally defined as the study of matter, energy, and the relation between them; it was called natural philosophy until the late 19th cent. and is still known by this na...

Devils Tower National Monument

(Encyclopedia)Devils Tower National Monument, 1,347 acres (546 hectares), overlooking the Belle Fourche River, NE Wyo.; it was the first designated U.S. national monument (1906). Devils Tower, 865 ft (264 m) high a...

Davidson, Donald Herbert

(Encyclopedia)Davidson, Donald Herbert, 1917–2003, American philosopher, b. Springfield, Mass., grad. Harvard (B.A., 1939; Ph.D., 1949). A student of W. V. Quine, Davidson emerged as one of the major figures in p...

Colden, Cadwallader

(Encyclopedia)Colden, Cadwallader kōlˈdən [key], 1688–1776, colonial scholar and political leader of New York, b. Ireland, of Scottish parents. After studying medicine in London, Colden arrived (1710) in Phila...

Englert, François

(Encyclopedia)Englert, François, 1932–, Belgian theoretical physicist, Ph.D. Université libre de Bruxelles (U.L.B.), Brussels, 1959. He has been a professor at U.L.B. since 1964. Englert was the recipient, join...

Feuerbach, Ludwig Andreas

(Encyclopedia)Feuerbach, Ludwig Andreas foiˈərbäkh [key], 1804–72, German philosopher, educated at Heidelberg and Berlin; son of Paul Johann Anselm von Feuerbach. At first a Hegelian, he abandoned absolute id...

hydrogen sulfide

(Encyclopedia)hydrogen sulfide, chemical compound, H2S, a colorless, extremely poisonous gas that has a very disagreeable odor, much like that of rotten eggs. It is slightly soluble in water and is soluble in carbo...

Ibn Gabirol, Solomon ben Judah

(Encyclopedia)Ibn Gabirol, Solomon ben Judah ĭˈbən gäbēˈrôl [key], c.1021–1058, Jewish poet and philosopher, known also as Avicebron, b. Malaga. His secular poetry deals partly with nature and love, but mo...

gravel

(Encyclopedia)gravel, particles of rock, i.e., stones and pebbles, usually round in form and intermediate in size between sand grains and boulders. Gravel is composed of various kinds of rock, the most common const...