advanced practice nurse a registered nurse having education beyond the basic nursing education and certified by a nationally recognized professional organization in a nursing specialty, or meeting other criteria established by a Board of Nursing.
Quick Answer. The air that makes up Earth's atmosphere contains 20.9 percent oxygen. This is true up to about 70,000 feet above sea level. However, above 10,000 feet, the atmosphere becomes too thin to support human life, even though its proportions do not change much. Continue Reading.
Assuming we're talking about the air around us, the gas you breathe in is actually a mixture of gases. Roughly 80% of it is nitrogen gas which and a little under 20% of it is â¦ oxygen which is the part we need. About 1% of the atmosphere is neither oxygen or nitrogen and crudely speaking is everything else that's in the air, about 0.05% is carbon dioxide and there are small amounts of xenon, helium, methane etc.