Columbia Encyclopedia

Search results

326 results found

O'Brien, Edna

(Encyclopedia)O'Brien, Edna, 1932–, Irish writer. Although she moved to London in 1954, her constant theme and recurring setting is Ireland. In richly sensual prose, O'Brien explores the dreams, failed marriages,...

Pará, state, Brazil

(Encyclopedia)Pará pəräˈ [key], state (1996 pop. 5,552,783), 474,896 sq mi (1,229,981 sq km), N Brazil, in the lower Amazon River basin bordering on the Guianas and the Atlantic Ocean. Belém is the capital. Mo...

Northumbria, kingdom of

(Encyclopedia)Northumbria, kingdom of nôrthŭmˈbrēˈə [key], one of the Anglo-Saxon kingdoms in England. It was originally composed of two independent kingdoms divided by the Tees River, Bernicia (including mod...

nitric acid

(Encyclopedia)nitric acid, chemical compound, HNO3, colorless, highly corrosive, poisonous liquid that gives off choking red or yellow fumes in moist air. It is miscible with water in all proportions. It forms an a...

solar time

(Encyclopedia)solar time, time defined by the position of the sun. The solar day is the time it takes for the sun to return to the same meridian in the sky. Local solar time is measured by a sundial. When the cente...

capacitor

(Encyclopedia)capacitor or condenser, device for the storage of electric charge. Simple capacitors consist of two plates made of an electrically conducting material (e.g., a metal) and separated by a nonconducting ...

differential geometry

(Encyclopedia)differential geometry, branch of geometry in which the concepts of the calculus are applied to curves, surfaces, and other geometric entities. The approach in classical differential geometry involves ...

le Carré, John

(Encyclopedia)le Carré, John lə kärāˈ [key], pseud. of David John Moore Cornwell, 1931–2020, English novelist. He was a tutor at Eton College (1956–58), and subsequently worked for the British foreign serv...

Lorentz contraction

(Encyclopedia)Lorentz contraction lôrˈĕnts [key], in physics, contraction or foreshortening of a moving body in the direction of its motion, proposed by H. A. Lorentz on theoretical grounds and based on an earli...

acceleration

(Encyclopedia)acceleration, change in the velocity of a body with respect to time. Since velocity is a vector quantity, involving both magnitude and direction, acceleration is also a vector. In order to produce an ...