| 单词 | bismuth |
| 释义 | Word Frequency bismuth(ˈbɪzməθ) noun a brittle pinkish-white crystalline metallic element having low thermal and electrical conductivity, which expands on cooling. It is widely used in alloys, esp low-melting alloys in fire safety devices; its compounds are used in medicines. Symbol: Bi; atomic no: 83; atomic wt: 208.98037; valency: 3 or 5; relative density: 9.747; melting pt: 271.4°C; boiling pt: 1564±5°C Derived forms bismuthal (ˈbɪzməθəl) adjective Word origin C17: from New Latin bisemūtum, from German Wismut, of unknown origin |
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