Columbia Encyclopedia

Search results

500 results found

thermometer

(Encyclopedia)thermometer, instrument for measuring temperature. Galileo and Sanctorius devised thermometers consisting essentially of a bulb with a tubular projection, the open end of which was immersed in a liqui...

pyrite

(Encyclopedia)pyrite pīrīˈtēz, pə–, pīˈrīts [key], pale brass-yellow mineral, the bisulfide of iron, FeS2. It occurs most commonly in crystals (belonging to the isometric system and usually in the form of...

bimetallism

(Encyclopedia)bimetallism bīmĕtˈəlĭzˌəm [key], in economic history, monetary system in which two commodities, usually gold and silver, were used as a standard and coined without limit at a ratio fixed by leg...

Yerevan

(Encyclopedia)Yerevan yĕrĕvänˈ [key], Rus. Erivan, city (1989 pop. 1,201,539), capital of Armenia, on the Razdan River. A leading industrial, cultural, and scientific center, Yerevan is also a rail junction and...

Reading, cities, United States

(Encyclopedia)Reading. rĕdˈĭng [key] 1 Town (1990 pop. 22,539), Middlesex co., NE Mass., a suburb of Boston; settled 1639, set off from Lynn and inc. 1644. Printing is the major industry. A 17th-century tavern i...

Serra, Richard

(Encyclopedia)Serra, Richard, 1939–, American sculptor, b. San Francisco; grad. Univ. of California, Santa Barbara (B.A., 1961), Yale (B.F.A., M.F.A., 1974). Many of his early works (1960s) are cast in rubber or ...

rivet

(Encyclopedia)rivet, headed metal pin or bolt whose shaft is passed through holes in two or more pieces of metal, wood, plastic, or other material in order to unite them by forming the plain end into a second head....

Bactria

(Encyclopedia)Bactria băkˈtrēə [key], ancient Greek kingdom in central Asia. Its capital was Bactra, present-day Balkh in N Afghanistan. Before the Greek conquest, the region was an eastern province of the Pers...

nickel

(Encyclopedia)nickel, metallic chemical element; symbol Ni; at. no. 28; at. wt. 58.6934; m.p. about 1,453℃; b.p. about 2,732℃; sp. gr. 8.902 at 25℃; valence 0, +1, +2, +3, or +4. Nickel is a hard, malleable, ...

recycling

(Encyclopedia)recycling, the process of recovering and reusing waste products—from household use, manufacturing, agriculture, and business—and thereby reducing their burden on the environment. During World War ...