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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...

gravitation

(Encyclopedia)gravitation, the attractive force existing between any two particles of matter. The term gravitygravity is commonly used synonymously with gravitation, but in correct usage a definite distinction is...

Raeburn, Sir Henry

(Encyclopedia)Raeburn, Sir Henry rāˈbərn [key], 1756–1823, Scottish portrait painter, b. near Edinburgh. He was apprenticed to a goldsmith at 15 and he showed considerable talent. In 1784 he went to London and...

Tarkington, Booth

(Encyclopedia)Tarkington, Booth (Newton Booth Tarkington), 1869–1946, American author, b. Indianapolis. His most characteristic and popular works were his genial novels of life in small Middle Western towns, incl...

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...

dimension, in physics

(Encyclopedia)dimension, in physics, an expression of the character of a derived quantity in relation to fundamental quantities, without regard for its numerical value. In any system of measurement, such as the met...

Wallace, Henry

(Encyclopedia)Wallace, Henry, 1836–1916, American agricultural leader, b. West Newton, Pa., grad. Jefferson (later Washington and Jefferson) College, 1859. He studied (1861–63) theology and went (1863) to Iowa ...

National Symphony Orchestra

(Encyclopedia)National Symphony Orchestra (NSO), Washington, D.C., founded in 1931 by Hans Kindler, who conducted the orchestra until 1949. Its first home was Constitution Hall; since 1986 it has been affiliated wi...

Rivlin, Alice M.

(Encyclopedia)Rivlin, Alice M., 1931–2019, American economist, b. Philadelphia as Georgianna Alice Mitchell, Ph.D. Harvard, 1958. Rivlin was affiliated with the Brookings Institution at various times from 1957 un...

fiat money

(Encyclopedia)fiat money fīˈət, fīˈăt [key], inconvertible money that is made legal tender by the decree, or fiat, of the government but that is not covered by a specie reserve. It is commonly understood to b...