How do you find the partial pressure of oxygen?

1 Answer
Aug 21, 2016


In what circumstance?


In a gaseous mixture, the partial pressure of a gaseous component is the same as the pressure it would exert if that gas alone occupied the container.

We are currently breathing air at #1# #atm# pressure. Given the normal composition of air, 78% dinitrogen, 21% dioxygen, 1% other gases, we can say quite categorically that the partial pressure of dioxygen in the atmosphere is approx. #0.2*atm#, and the partial pressure of dinitrogen is approx. #0.8*atm#. The total pressure is of course the sum of the individual partial pressures.