| 释义 |
nitrogen dioxide
noun
: a suffocating poisonous strongly oxidizing gas that is reddish brown and has the formula NO2 at 150° C but becomes paler on being cooled because it dimerizes to nitrogen tetroxide, that is usually obtained in an equilibrium mixture with nitrogen tetroxide by oxidation (as of nitric oxide or ammonia), by reduction of nitric acid, or by decomposition of lead nitrate, and that is used in either gaseous or liquefied form chiefly in making concentrated nitric acid, in nitration processes, and as an oxidizing agent (as in rocket propellants) — called also nitrogen(IV) oxide |