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Heisenberg, Werner

(Encyclopedia)Heisenberg, Werner vĕrˈnər hīˈzənbĕrk [key], 1901–76, German physicist. One of the founders of the quantum theory, he is best known for his uncertainty principle, or indeterminacy principle, ...

dust, atmospheric

(Encyclopedia)dust, atmospheric, minute particles slowly settling or suspended by slight currents and existing in varying amounts in all air. There is least dust at high levels over the ocean and most at low levels...

closed shop and open shop

(Encyclopedia)closed shop and open shop. The term “closed shop” is used to signify an establishment employing only members of a labor union. The union shop, a closely allied term, indicates a company where empl...

False Decretals

(Encyclopedia)False Decretals dĭkrēˈtəlz [key], collection of documents, partly spurious, treating of canon law. It was composed between 847 and 852 probably in France, either at Reims or in the province of Tou...

Pollock, Jackson

(Encyclopedia)Pollock, Jackson, 1912–56, American painter, b. Cody, Wyo. He studied (1929–31) in New York City, mainly under Thomas Hart Benton, but he was more strongly influenced by A. P. Ryder and the Mexica...

sanction

(Encyclopedia)sanction, in law and ethics, any inducement to individuals or groups to follow or refrain from following a particular course of conduct. All societies impose sanctions on their members in order to enc...

tribune

(Encyclopedia)tribune, in ancient Rome, one of various officers. The history of the office of tribune is closely associated with the struggle of the plebs against the patrician class to achieve a more equitable pos...

villein

(Encyclopedia)villein vĭlˈən [key] [O.Fr.,=village dweller], peasant under the manorial system of medieval Western Europe. The term applies especially to serfs in England, where by the 13th cent. the entire unfr...

stratosphere

(Encyclopedia)stratosphere strătˈəsfēr [key], second lowest layer of the earth's atmosphere. The level from which it extends outward varies with latitude; it begins c.51⁄2 mi (9 km) above the poles, c.6 or 7 ...

calorie

(Encyclopedia)calorie, abbr. cal, unit of heat energy in the metric system. The measurement of heat is called calorimetry. The calorie, or gram calorie, is the quantity of heat required to raise the temperature of ...