| 单词 | nitrogen |
| 释义 | nitrogen /nuy"treuh jeuhn/, n. Chem. a colorless, odorless, gaseous element that constitutes about four-fifths of the volume of the atmosphere and is present in combined form in animal and vegetable tissues, esp. in proteins: used chiefly in the manufacture of ammonia, nitric acid, cyanide, explosives, fertilizer, dyes, as a cooling agent, etc. Symbol: N; at. wt.: 14.0067; at. no.: 7; density: 1.2506 g/l at 0°C and 760 mm pressure. [1785-95; < F nitrogène. See NITRO-, -GEN] |
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