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atom

(Encyclopedia)CE5 Bohr-Rutherford atom CE5 Probability distribution of the electron in the hydrogen atom: A. Ground state B. Highly excited state atom [Gr.,=uncuttable (indivisible)], basic unit of matte...

Neurath, Otto

(Encyclopedia)Neurath, Otto, 1882–1945, Austrian philosopher, social scientist, and design theorist, b. Vienna. During the 1920s and 30s he was both a Marxist and a member of the Vienna Circle, an exponent of log...

liquid crystal

(Encyclopedia)liquid crystal, liquid whose component particles, atoms or molecules, tend to arrange themselves with a degree of order far exceeding that found in ordinary liquids and approaching that of solid cryst...

mannerism

(Encyclopedia)mannerism, a style in art and architecture (c.1520–1600), originating in Italy as a reaction against the equilibrium of form and proportions characteristic of the High Renaissance. In Florence, Pont...

terbium

(Encyclopedia)terbium tûrˈbēəm [key] [from Ytterby, a village in Sweden], metallic chemical element; symbol Tb; at. no. 65; at. wt. 158.92535; m.p. 1,356℃; b.p. 3,123℃; sp. gr. about 8.25; valence +3 or +4....

europium

(Encyclopedia)europium yo͝orōˈpēəm [key] [from Europe], metallic chemical element; symbol Eu; at. no. 63; at. wt. 151.964; m.p. about 820℃; b.p. about 1,600℃; sp. gr. 5.25 at 25℃; valence +2 or +3. Europ...

Beowulf

(Encyclopedia)Beowulf bāˈəwo͝olf [key], oldest English epic, probably composed in the early 8th cent. by an Anglian bard in the vicinity of Northumbria. It survives in only one manuscript, written c.a.d. 1000 b...

Reynolds number

(Encyclopedia)Reynolds number [for Osborne Reynolds], dimensionless quantity associated with the smoothness of flow of a fluid. It is an important quantity used in aerodynamics and hydraulics. At low velocities flu...

Rogers, Will

(Encyclopedia)Rogers, Will (William Penn Adair Rogers), 1879–1935, American humorist, b. Oolagah, Indian Territory (now in Oklahoma). In his youth he worked as a cowboy in Oklahoma, and after traveling over the w...

second

(Encyclopedia)second, abbr. sec or s, fundamental unit of time in all systems of measurement. In practical terms, the second is 1/60 of a minute, 1/3,600 of an hour, or 1/86,400 of a day. Since the length of the da...