There is 21% of oxygen in the air.
Around 16% of the air you breathe out is oxygen. This percentage decreases from the 21% of oxygen in the air you inhale due to the exchange of gases that occurs during respiration.
21% Oxygen, 78% Nitrogen, 1% other gasses in out atmosphere.
The air is made up, mostly, of oxygen and nitrogen.. Air is 78 % nitrogen, 21 % oxygen, about 1 % argon, and a whole raft of other gases present in even smaller amounts..
Oxygen is approximately 21% of the air we breathe.
Since the density of the air in a tornado is reduced by the pressure drop the overall concentration of oxygen is lower than it would normally be. Some estimates indicate that in the very largest tornadoes (which have the largest pressure drops) may have as little as 70% the normal amount of air and thus oxygen.
Air is approximately 20% Oxygen.
Oxygen - yes. Air - no. Not much of that around underwater.
About 20% of the volume of the air in the room is oxygen.
Around 16% of the air you breathe out is oxygen. This percentage decreases from the 21% of oxygen in the air you inhale due to the exchange of gases that occurs during respiration.
A small percent . exhaled air always contains oxygen .
Concentration of oxygen in dry air is 20,946 %.
ideally 21% (20.95%)
Oxygen, of course.
The concentration of oxygen in the air is much much higher than in the water. This make obtaining oxygen much easier and strenuous activity (to a level higher than that is water) possible.
Oxygen keeps animals alive, Nitrogen is not much use.
In 1973, the composition of Earth's atmosphere was roughly the same as it is today, with oxygen making up about 21% of the air.
Approx 180ml