The composition of normal, dry atmospheric air is 20.95 percent oxygen, 0.03% carbon dioxide and 78.08% nitrogen. The normal atmospheric pressure at sea level is about 760 mmHg.
The total pressure exerted by a gas mixture is equal to the sum of pressures exerted by each constituents gas ( dalton's law)
p02= 159.2 mmHg
pco2= 0.03 mmHg
pN2= 600.6 mmHg
Atmospheric pressure increases markedly underwater.
the atmospheric pressure decreases in high altitude. The metabolism of soil microbes and small soil animals can reduce the fractional oxygen content and elevate the carbodioxide content of soil air. Atmospheric air always contains some water vapor. Water in equilibrium with air will have the sane gas partial pressures as the saturated air but may have considrably different molar concentrations of the gases. Solubility of gases in liquid are different. solubility coefficient depends on the gas, the nature of solvent, temperature and ionic strength. Respiratory system
Diffusion is simply the movement of molecules from one region to another due to their random thermal motion.
compostion of air
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