| 单词 | carbon |
| 释义 | Word Frequency carbon(ˈkɑːbən) noun 1. a. a nonmetallic element existing in the three crystalline forms: graphite, diamond, and buckminsterfullerene: occurring in carbon dioxide, coal, oil, and all organic compounds. The isotope carbon-12 has been adopted as the standard for atomic weight; carbon-14, a radioisotope with a half-life of 5700 years, is used in radiocarbon dating and as a tracer. Symbol: C; atomic no: 6; atomic wt: 12.011; valency: 2, 3, or 4; relative density: 1.8–2.1 (amorphous), 1.9–2.3 (graphite), 3.15–3.53 (diamond); sublimes at 3367±25°C; boiling pt: 4827°C b. (as modifier) a carbon compound 2. short for carbon paper, carbon copy 3. a carbon electrode used in a carbon-arc light or in carbon-arc welding 4. a rod or plate, made of carbon, used in some types of battery Derived forms carbonous (ˈcarbonous) adjective Word origin C18: from French carbone, from Latin carbō charcoal, dead or glowing coal |
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