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fluorine

(Encyclopedia)fluorine flo͞oˈərēn, –rĭn [key], gaseous chemical element; symbol F; at. no. 9; at. wt. 18.9984; m.p. −219.6℃; b.p. −188.14℃; density 1.696 grams per liter at STP; valence −1. Fluorin...

photographic processing

(Encyclopedia)photographic processing, set of procedures by which the latent, or invisible, image produced when a photographic film is exposed to light is made into a permanent visible image. The negative may b...

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 ...

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, ...

canoe

(Encyclopedia)canoe kəno͞oˈ [key], long, narrow watercraft with sharp ends originally used by most peoples. It is usually propelled by means of paddles, although sails and, more recently, outboard motors are als...

KwaZulu-Natal

(Encyclopedia)KwaZulu-Natal kwäzo͞oˈlo͞o-nätälˈ [key], province (2011 pop. 10,267,300), 36,433 sq mi (94,361 sq km), E South Africa, on the Indian Ocean. Formerly Natal province, in the post-apartheid consti...

Zaporizhzhya

(Encyclopedia)Zaporizhzhya zäpˌərĭzhˈə [key], Rus. Zaporozhye, city (1989 pop. 884,000), capital of Zaporizhzhya region, in Ukraine, a port on the Dnieper River, opposite the island of Khortytsya. The city, f...

Urals

(Encyclopedia)Urals or Ural Mountains, E European Russia and NW Kazakhstan, forming, together with the Ural River, the traditional boundary between Europe and Asia and separating the Russian plain from the W Siberi...

Louvre

(Encyclopedia)Louvre lo͞oˈvrə [key], foremost French museum of art, located in Paris. The building was a royal fortress and palace built by Philip II in the late 12th cent. In 1546 Pierre Lescot was commissioned...

Newark, cities, United States

(Encyclopedia)Newark. 1 City (1990 pop. 37,861), Alameda co., W Calif., on the east side of San Francisco Bay; inc. 1955. There is food processing and the manufacture of plastics, furniture, feeds, semiconductors, ...