Inhaled air:
Element / Pressure/ Percent (%)
Nitrogen / 597,0 mmHg./ 78,62
Oxygen / 159,0 mmHg./ 20,84
C / 0,3 mmHg./0,04
Water / 3,7 mmHg. / 0,50
Total / 760,0 mmHg./ 100,00
Since carbonic gases are comparatively less
CO2 is the component of air that we normally don't breathe in