Nitrogen
81nitrogen narcosis — Pathol. a semistupor, lightheadedness, or euphoria experienced by deep sea divers when nitrogen from air enters the blood at higher than atmospheric pressure. Also called rapture of the deep. [1935 40] * * * or nitrogen euphoria or raptures of… …
82Nitrogen rejection unit — A nitrogen rejection unit (NRU) selectively removes nitrogen from a gas. The name can be applied any system that removes nitrogen from natural gas. For high flow rate applications, cryogenic processing is the norm[citation needed]. This is a… …
83Nitrogen Rejection Unit — A Nitrogen Rejection Unit (NRU) removes impurities from a gas by liquifying and regasifying the stream.A Nitrogen Rejection Unit is any system that removes nitrogen from natural gas. For much larger applications, cyrogenic processing is the norm …
84nitrogen balance — noun the balance between the amount of nitrogen taken in (to the soil or the body) and the amount given off (lost or excreted) • Hypernyms: ↑balance * * * noun 1. : the difference between nitrogen intake and nitrogen excretion in the animal body …
85nitrogen oxide — noun any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials; present in car exhausts (Freq. 1) • Hypernyms: ↑oxide, ↑pollutant * * * noun : any of several oxides of nitrogen some of which are formed in a… …
86nitrogen-fixing — adjective contributing to the process of nitrogen fixation • Pertains to noun: ↑nitrogen fixation * * * | ̷ ̷ ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷ adjective Etymology: nitrogen + fixing, from present participle of fix (I) : having the power of nitrogen fixation… …
87nitrogen fixation — The incorporation of atmospheric nitrogen into ammonia by various bacteria, catalysed by nitrogenase. This is an essential stage in the nitrogen cycle and is the ultimate source of all nitrogen in living organisms. In the sea, the main nitrogen… …
88nitrogen-fixing bacteria — ▪ biology and ecology microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen, inorganic compounds usable by plants. More than 90 percent of all nitrogen fixation is effected by them. Two kinds of nitrogen… …
89nitrogen oxides — (NOx) In the combustion process, nitrogen from the air combines with oxygen to form nitrogen oxides such as nitric oxide and nitrogen dioxide. Nitric oxide is the main oxide of nitrogen emitted in raw exhaust gas, typically 90%; nitric oxide and… …
90nitrogen cycle — noun the circulation of nitrogen; nitrates from the soil are absorbed by plants which are eaten by animals that die and decay returning the nitrogen back to the soil • Hypernyms: ↑organic process, ↑biological process * * * ˈnitrogen cycle 7… …
