单词 | 四水硼砂 |
释义 | 〔boron〕A soft, brown, amorphous or crystalline nonmetallic element, extracted chiefly from kernite and borax and used in flares, propellant mixtures, nuclear reactor control elements, abrasives, and hard metallic alloys. Atomic number 5; atomic weight 10.811; melting point 2,300°C; sublimation point 2,550°C; specific gravity (crystal) 2.34; valence 3. See table at element 硼:一种柔软、棕色、无定形或结晶的非金属元素,主要从四水硼砂和硼砂中提取,用于闪光剂、推进混合物、原子反应控制剂、磨砂和硬合金中。原子序数5;原子量10.811;熔点2,300°C;沸点2,550°C;比重(晶体)2.34;化合价3 参见 element〔kernite〕A colorless to white lustrous crystalline mineral, Na2B 4O 7·4H 2O, that is a major source of ore of boron. 四水硼砂:一种无色或白色的光亮晶体矿物,Na2B 4O 7·4H 2O,是硼矿的主要来源 |
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