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manganese 音標拼音: [m'æŋgən ,iz] n. 錳[金屬元素] 錳[金屬元素] manganese n 1: a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals [ synonym: { manganese}, { Mn}, { atomic number 25}] Manganese \ Man` ga* nese"\, n. [ F. mangan[` e] se, It. manganese, sasso magnesio; prob. corrupted from L. magnes, because of its resemblance to the magnet. See { Magnet}, and cf. { Magnesia}.] ( Chem.) An element obtained by reduction of its oxide, as a hard, grayish white metal, fusible with difficulty ( melting point 1244[ deg] C), but easily oxidized. Its ores occur abundantly in nature as the minerals pyrolusite, manganite, etc. Symbol Mn. Atomic number 25; Atomic weight 54. 938 [ C= 12. 011]. [ 1913 Webster PJC] Note: An alloy of manganese with iron ( called ferromanganese) is used to increase the density and hardness of steel. [ 1913 Webster] { Black oxide of manganese}, { Manganese dioxide} or { Manganese peroxide}, or { Black manganese} ( Chem.), a heavy black powder { MnO2}, occurring native as the mineral pyrolusite, and valuable as a strong oxidizer; -- called also familiarly { manganese}. It colors glass violet, and is used as a decolorizer to remove the green tint of impure glass. [ 1913 Webster]
Mn \ Mn\, n. ( Chem.) The chemical symbol for { manganese}. [ PJC] |
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