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magnesium 音标拼音: [mægn'iziəm] n. 镁 镁 magnesium n 1: a light silver- white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination ( as in magnesite and dolomite and carnallite and spinel and olivine) [ synonym: { magnesium}, { Mg}, { atomic number 12}] Magnesium \ Mag* ne" si* um\, n. [ NL. & F. See { Magnesia}.] ( Chem.) A light silver- white metallic element of atomic number 12, malleable and ductile, quite permanent in dry air but tarnishing in moist air. It burns, forming ( the oxide) magnesia, with the production of a blinding light ( the so- called magnesium light) which is used in signaling, in pyrotechny, or in photography where a strong actinic illuminant is required. Its compounds occur abundantly, as in dolomite, talc, meerschaum, etc. Symbol Mg. Atomic weight, 24. 305. Specific gravity, 1. 75. [ 1913 Webster] { Magnesium sulphate}. ( Chem.) Same as { Epsom salts}. [ 1913 Webster] |
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