Room air is about 21% oxygen.
21% of the air is oxygen
oxygen percentage in air is 20%
30%
Air contains about 19-20% oxygen
21%oxygen
78% Nitrogen 20.5% Oxygen .5% Argon 1% Others for small calculations we take percentage of oxygen in air as 21%
About 18%
About 21%.
About 21%
about 21%
100%. All of the oxygen that I breathe comes from the air! The answer that you were probably after, but did not ask, was about the percentage of oxygen in the air that we breathe. The questions may sound similar but they are not the same. The answer is a little over 20%.
21% of air is pure oxygen