| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024bar•i•um /ˈbɛriəm, ˈbær-/USA pronunciation n. [uncountable]- Chemistrya whitish, soft metallic element.
WordReference Random House Unabridged Dictionary of American English © 2024bar•i•um (bâr′ē əm, bar′-),USA pronunciation n. [Chem.]- Chemistrya whitish, malleable, active, divalent, metallic element, occurring in combination chiefly as barite or as witherite. Symbol: Ba;
at. wt.: 137.34;
at. no.: 56;
sp. gr.: 3.5 at 20°C.
Collins Concise English Dictionary © HarperCollins Publishers:: barium /ˈbɛərɪəm/ n - a soft silvery-white metallic element of the alkaline earth group. It is used in bearing alloys and compounds are used as pigments. Symbol: Ba; atomic no: 56; atomic wt: 137.327; valency: 2; relative density: 3.5; melting pt: 729°C; boiling pt: 1805°C
Etymology: 19th Century: from bar( yta) + -ium |