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Le Châtelier's principle
(Encyclopedia)Le Châtelier's principle, chemical principle that states that if a system in equilibrium is disturbed by changes in determining factors, such as temperature, pressure, and concentration of components...Philadelphia Orchestra
(Encyclopedia)Philadelphia Orchestra, founded 1900 by Fritz Scheel, who was its conductor until his death in 1907. Scheel was followed by Karl Pohlig (1907–12). Under the leadership (1912–38) of Leopold Stokows...actinium
(Encyclopedia)actinium ăktĭnˈēəm [key] [Gr.,=like a ray], radioactive chemical element; symbol Ac; at. no. 89; mass number of most stable isotope 227; m.p. about 1,050℃; b.p. 3,200℃±300℃; sp. gr. 10.07;...Krupp
(Encyclopedia)Krupp kro͝op [key], family of German armament manufacturers. The family settled in Essen in the 16th cent. The core of the great Krupp industrial empire was started by Friedrich Krupp, 1787–1826, w...Polybius
(Encyclopedia)Polybius pōlĭˈbēəs [key], 203? b.c.–c.120 b.c., Greek historian, b. Megalopolis. As one of the leaders of the Achaean League and a friend of Philopoemen, he was influential in Greek politics. H...syphilis
(Encyclopedia)syphilis sĭfˈəlĭs [key], contagious sexually transmitted disease caused by the spirochete Treponema pallidum (described by Fritz Schaudinn and Erich Hoffmann in 1905). Syphilis was not widely reco...industrial management
(Encyclopedia)industrial management, term applied to highly organized modern methods of carrying on industrial, especially manufacturing, operations. Modern technological devices, particularly in the areas of com...nitrogen
(Encyclopedia)nitrogen nīˈtrəjən [key], gaseous chemical element; symbol N; at. no. 7; interval in which at. wt. ranges 14.00643–14.00728; m.p. −209.86℃; b.p. −195.8℃; density 1.25 grams per liter at ...atomic bomb
(Encyclopedia)atomic bomb or A-bomb, weapon deriving its explosive force from the release of nuclear energy through the fission (splitting) of heavy atomic nuclei. The first atomic bomb was produced at the Los Alam...ammonia
(Encyclopedia)ammonia, chemical compound, NH3, colorless gas that is about one half as dense as air at ordinary temperatures and pressures. It has a characteristic pungent, penetrating odor. Ammonia forms a minute ...Browse by Subject
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