That's a really good point that I've never really thought about and I might have to do some research to try and find a reason behind it.Originally Posted by shinek
That's a really good point that I've never really thought about and I might have to do some research to try and find a reason behind it.However, the air we breath contains about 21% oxygen on the way in and about 16-17% on the way out. If we don't take up any more oxygen than that, why bother, under normal circumstances, to put any more oxygen in the mixture.
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