Somthing
men
Calculate the area of the room. Calculate the area of the window (or whatever opening) Room Area*100/Window Area
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%.
2.66666666667 is the decimal of oxygen in the air
That would depend on the size of the room and the humidity.