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vortex

(Encyclopedia)vortex vôrˈtĕks [key], mass of fluid in whirling or rotary motion. To simplify the analysis, vortex motion usually describes motions in a frictionless fluid. In such cases the absence of friction w...

Brownian movement

(Encyclopedia)Brownian movement or motion, zigzag, irregular motion exhibited by minute particles of matter when suspended in a fluid. The effect has been observed in all types of colloidal suspensions (see colloid...

Aurora, cities, United States

(Encyclopedia)Aurora ərôrˈə, ô– [key]. 1 City (2020 pop. 386,261), Adams and Arapahoe counties, N central Colo., a growing suburb on the east side of Denver; inc. 1903. Founded d...

Winfrey, Oprah

(Encyclopedia)Winfrey, Oprah, 1954–, African-American television host, actress, and media magnate, b. Kosciusko, Miss., as Orpah Gail Winfrey, grad. Tennessee State Univ. (1976). She began her career as a Nashvil...

xenon

(Encyclopedia)xenon zēˈnŏn [key] [Gr.,=strange], gaseous chemical element; symbol Xe; at. no. 54; at. wt. 131.293; m.p. −111.9℃; b.p. −107.1℃; density 5.86 grams per liter at STP; valence usually 0. Xeno...

Eakins, Thomas

(Encyclopedia)Eakins, Thomas āˈkĭnz [key], 1844–1916, American painter, photographer, and sculptor, b. Philadelphia, where he worked most of his life. Eakins is considered the foremost American portrait painte...

gear

(Encyclopedia)CE5 Types of gears gear, toothed wheel, cylinder, or cone that transmits motion from one part of a machine to another; it is one of the oldest means of transmitting motion. When the teeth of two g...

crank

(Encyclopedia)crank, mechanical linkage consisting of a bar attached to a pivot at one of its ends in such a way that it is capable of rotating through a complete circle about the pivot. One of the principal uses o...

Lumet, Sidney

(Encyclopedia)Lumet, Sidney lo͞o-mĕtˈ [key], 1924–2011, one of the great American film directors of the 20th cent., b. Philadelphia. A child actor in New York's Yiddish radio and theater and (1935–41) on Bro...

Kennedy, Joseph Patrick

(Encyclopedia)Kennedy, Joseph Patrick, 1888–1969, U.S. ambassador to Great Britain (1937–40), b. Boston, grad. Harvard, 1912. The founder of an American dynasty, he was the father of nine children, including Jo...