Quote:
Originally Posted by WillowTheWhisp
Don't blow 'air' into the tank through a straw. That is your outgoing air and not oxygen rich. You've absorbed your oxygen from it when it was your incoming air. 
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There is still plenty of oxygen in your exhaled air, that's how CPR works, if there was no oxygen in your breath what would be the point of blowing it into someone's lungs. I can't remember the % but you only absorb some of the oxygen in the air you breath.
Next time I will read all the thread before commenting, I did not notice our local paramedic had said the same as me
