Originally Posted by
Fuzz
You can overdose on oxygen too.
The body is designed for 21% not 95%
It ends up breaking down the cells of the lungs as they cannot cope with that much oxygen
As a diver in an emergency I'm trained to give O2 and you have to give a certain amount of "air" breaks in between
We used to breathe oxygen at 100% when flying at very high level and if we had a pressurisation failure we would be pressure breathing at 100% until we had descended to lower level.
This of course is to maintain the required partial pressure of oxygen in the lungs since the pressurisation in the aircraft was low.
Les