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Ferrara-Florence, Council of

(Encyclopedia)Ferrara-Florence, Council of, 1438–45, second part of the 17th ecumenical council of the Roman Catholic Church; the first part was the Council of Basel, canonically convened but after 1437 schismati...

antimony

(Encyclopedia)antimony ănˈtĭmōˌnē [key] [Lat. antimoneum], semimetallic chemical element; symbol Sb [Lat. stibium,=a mark]; at. no. 51; at. wt. 121.760; m.p. 630.74℃; b.p. 1,750℃; sp. gr. (metallic form) ...

holography

(Encyclopedia)holography hŏlŏgˈrəfē, hō– [key], method of reproducing a three-dimensional image of an object by means of light wave patterns recorded on a photographic plate or film. Holography is sometimes...

Jackson

(Encyclopedia)Jackson. 1 City (1990 pop. 37,446), seat of Jackson co., S Mich., on the Grand River; inc. 1857. It is an industrial and commercial center in a farm region. The city's chief manufactures are machinery...

atonality

(Encyclopedia)atonality āˌtōnălˈĭtē [key], in music, systematic avoidance of harmonic or melodic reference to tonal centers (see key). The term is used to designate a method of composition in which the compo...

activation energy

(Encyclopedia)CE5 Energy profile of an exothermic reaction: Although the total energy of the products is less than that of the reactants, the activation energy must be added to weaken or break existing bonds bef...

Wilmington

(Encyclopedia)Wilmington. 1 City (1990 pop. 71,529), seat of New Castle co., NE Del., on the Delaware River and tributary streams, the Christina and the Brandywine; settled 1638, inc. as a city 1832. The state's la...

blood pressure

(Encyclopedia)blood pressure, force exerted by the blood upon the walls of the arteries. The pressure in the arteries originates in the pumping action of the heart, and pressure waves can be felt at the wrist and a...

Tampa

(Encyclopedia)Tampa tămˈpə [key], city (1990 pop. 280,015), seat of Hillsborough co., W Fla., a port of entry with an impressive harbor on Tampa Bay; inc. 1855. The third largest city in the state, Tampa has lon...

vaporization

(Encyclopedia)vaporization, change of a liquid or solid substance to a gas or vapor. There is fundamentally no difference between the terms gas and vapor, but gas is used commonly to describe a substance that appea...