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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 ...

Peale, Charles Willson

(Encyclopedia)Peale, Charles Willson pēl [key], 1741–1827, American portrait painter, naturalist, and inventor, b. Queen Annes County, Md. Charles Willson Peale's brother James Peale, 1749–1831, b. Cheste...

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 ...

lightning

(Encyclopedia)lightning, electrical discharge accompanied by thunder, commonly occurring during a thunderstorm. The discharge may take place between one part of a cloud and another part (intracloud), between one cl...

Harlan, John Marshall, 1833–1911, associate justice of the U.S. Supreme Court

(Encyclopedia)Harlan, John Marshall, 1833–1911, American jurist, associate justice of the U.S. Supreme Court (1877–1911), b. Boyle co., Ky., grad. Centre College, 1850. Admitted to the bar in 1853, he served in...

harmonica

(Encyclopedia)harmonica. 1 The simplest of the musical instruments employing free reeds, known also as the mouth organ or French harp. It was probably invented in 1829 by Friedrich Buschmann of Berlin, who called h...