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ratio

(Encyclopedia)ratio. The ratio of two quantities expressed in terms of the same unit is the fraction that has the first quantity as numerator and the second as denominator. For example, if in a group of 100 people ...

Navajo Dam

(Encyclopedia)Navajo Dam, 402 ft (123 m) high and 3,648 ft (1,112 m) long, NW N.Mex., on the San Juan River, near the Colo. line; built 1958–63 by the U.S. Bureau of Reclamation. The dam, a major unit of the Colo...

Paphlagonia

(Encyclopedia)Paphlagonia păfˌləgōˈnēə [key], ancient country of N Asia Minor, between Bithynia and Pontus on the Black Sea coast, in modern Turkey. A mountainous district with the Halys as its chief river, ...

hertz

(Encyclopedia)hertz hûrts [key] [for Heinrich R. Hertz], abbr. Hz, unit of frequency, equal to 1 cycle per second. The term is combined with metric prefixes to denote multiple units such as the kilohertz (1,000 Hz...

Holston

(Encyclopedia)Holston, river, c.120 mi (190 km) long, formed by the uniting of its northern and southern forks, NE Tenn., and flowing SW through the Great Appalachian Valley, joining the French Broad River at Knoxv...

power, in physics

(Encyclopedia)power, in physics, time rate of doing work or of producing or expending energy. The unit of power based on the English units of measurement is the horsepower, devised for describing mechanical power b...

Cockrell, Francis Marion

(Encyclopedia)Cockrell, Francis Marion kŏkˈrəl [key], 1834–1915, Confederate general and U.S. senator, b. Johnson co., Mo. Enlisting as a private with Confederate forces in the Civil War, he became a brigadier...

Pamphylia

(Encyclopedia)Pamphylia pămfĭlˈēə [key], ancient region of S Asia Minor, on the coast between Lycia and Cilicia, in present S Turkey. Its chief cities were Attalia, Side, and Perga. Pamphylia was not a politic...

Ångström, Anders Jöns

(Encyclopedia)Ångström, Anders Jöns änˈdərs yöns ōngˈström [key], 1814–74, Swedish physicist. He was educated at the Univ. of Uppsala and in 1839 became a member of its faculty. He is particularly noted...

legion

(Encyclopedia)legion, large unit of the Roman army. It came into prominence c.400 b.c. It originally consisted of 3,000 to 4,000 men drawn into eight ranks: the first six ranks, called hoplites, were heavily armed,...