From FDRâs brushes with death to Eleanorâs midnight ride with Amelia Earhart, here are 10 things you may not know about this presidential pair. 1. Franklin Roosevelt was related to 11 other presidents.
By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.y volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.
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.