What is Partial Pressure?

Partial pressure is produced by a single gas in a mixture of gases. The table below shows the percentage composition of air. At a pressure of 1.013 bar the oxygen content is 21.224%, the partial pressure of oxygen in air is = 0.21224 bar or 212.24 mbar. The table can therefore be interpreted for partial pressures of the gas mixture in air

Gas
Nitrogen
Oxygen
Argon
Carbon dioxide
Neon
Helium
Krypton
Hydrogen
Xenon
Partial pressure
791.19 mbar
212.24 mbar
9.46 mbar
3.34 x 10-1 mbar
1.84 x 10-2 mbar
5.3 x 10 -3 mbar
1.16 x 10-3 mbar
5.0 x 10 -4 mbar
8.8 x 10 -5 mbar

Table 2
The table shows the partial pressures of the gases in air in relation
to the Standard pressure of dry air at sea level = 1013 mbar.