what is the percentage of nitrogen in air

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• percentage - per cent — When you express an amount as a percentage of a whole, you say how many parts the amount would have if the whole had 100 equal parts. You write a percentage as a number followed by per cent or by the symbol %. So, for example, if there are 1200… …   Useful english dictionary

• Nitrogen washout — (or Fowler s method) is a test for measuring dead space in the lung during a respiratory cycle, as well as some parameters related to the closure of airways. Contents 1 Procedure 2 Parameters 3 See also 4 References …   Wikipedia

• nitrogen group element — ▪ chemical elements Introduction  any of the chemical elements that constitute Group Va of the periodic table (see Figure >). The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The elements share… …   Universalium

• Nitrogen trifluoride — Nitrogen trifluoride …   Wikipedia

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• Enriched Air Nitrox — Nitrox refers to any gas mixture composed (excluding trace gases) of nitrogen and oxygen; this includes normal air which is approximately 78% nitrogen and 21% oxygen, with around 1% inert gases, primarily argon.cite book |title=Bennett and… …   Wikipedia

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