The composition of normal, dry, atmospheric air is 20.95% oxygen, 0.03% carbon dioxide and 78.08% nitrogen. The normal atmospheric pressure at sea level is about 76 mmHG. the total pressure exterted by a gas mixture is equal to the sum of pressures exerted by each constituents gas ( Dalton's law)
pO2= 159.2 mmHg
pCO2= 0.003 mmHg
pN2=600.6 mmHg
Atmospheric pressure increases markedly underwater.
composition of Air
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