nitrogen
氮气,氮,氮素,氮肥
Definitions
- 1
Chemistry.
- : 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, especially in proteins: used chiefly in the manufacture of ammonia, nitric acid, cyanide, explosives, fertilizer, dyes, as a cooling agent, etc. Symbol: N; atomic weight: 14.0067; atomic number: 7; density: 1.2506 grams/liter at 0°C and 760 millimeters pressure.
Examples
In the stratosphere, this electricity excites mostly nitrogen gas.
In fast-growing appendages that help them move, the sea stars that perished had high amounts of a form of nitrogen found in low oxygen conditions — a sign that those animals may have died from a lack of oxygen.
That’s because in the summer months, heat and sunlight react with the precursor gases in the atmosphere, like nitrogen dioxide, creating a toxic cocktail.
As Cahn explained, “You can’t control nitrogen without controlling your irrigation water.”
Carbon and nitrogen accumulate in tusks over an elephant’s lifetime through the food the animal eats and the water it drinks.
There is also more nitrogen in his varieties, and this contributes to a quick restart of fermentation after each filtration.
Grosvenor Place, which runs alongside the palace, has almost four times the maximum permissible amount of nitrogen dioxide.
Fresh out of jail, Dr. Krim receives an anonymous email to check the liquid nitrogen tanks back at her lab.
Achatz revamped his restaurant Alinea with a far-out, multi-course menu and futuristic liquid-nitrogen dishes.
Ammonia is a compound of nitrogen and hydrogen, but it cannot be formed by the direct union of these gases.
The form in which nitrogen may be absorbed has given rise to much difference of opinion.
Pigeons' dung, according to Boussingault, contains 8·3 per cent of nitrogen, equivalent to 10·0 of ammonia.
Refuse horse hair generally contains 11 or 12 per cent of nitrogen.
Dry peat of good quality contains about one per cent of nitrogen, and a quantity of ash varying from five to twenty per cent.