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Cb

(Encyclopedia)Cb, formerly the symbol for the element columbium, now called niobium (Nb). ...

(Encyclopedia)Skellefteå shĕlĕfˈtəōˌ [key], city (1990 pop. 31,050), Västerbotten co., NE Sweden, on the Skellefteälven River inland from its mouth on the Gulf of Bothnia. The center of a rich mining regio...

actinide series

(Encyclopedia)actinide series, a series of radioactive metallic elements in Group 3 of the periodic table. Members of the series are often called actinides, although actinium (at. no. 89) is not always considered a...

Nordland

(Encyclopedia)Nordland nôrˈlän, no͝orˈ– [key], county (1995 pop. 241,420), 14,798 sq mi (38,327 sq km), N central Norway, bordering on the Norwegian Sea in the west and on Sweden in the east. The chief towns...

Öskemen

(Encyclopedia)Öskemen o͝ostˌ-kəmyĭnəgôrskˈ [key], city (1989 pop. 324,478), NE Kazakhstan, on the Irtysh River and in the foothills of the W Altai Mts. It is a river port and an industrial center with zinc,...

plumbing

(Encyclopedia)plumbing, piping systems inside buildings for water supply and sewage. The Romans had a highly developed plumbing system; water was brought to Rome by aqueducts and distributed to homes in lead pipes�...

barium

(Encyclopedia)barium bârˈēəm [key] [Gr.,=heavy], metallic chemical element; symbol Ba; at. no. 56; at. wt. 137.327; m.p. 725℃; b.p. 1,640℃; sp. gr. 3.5 at 20℃; valence +2. Barium is a soft, silver-white, ...