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Maguilla27 03-12-2014 08:54 AM

Presentation and question about oxygen
 
Dear friends,

First of all, I would like to say: hello everybody and thank you for your help!!..

My name is Miguel and I am writing from Spain. I would like to make a simple question. As you know, in the air there is 20% of oxygen (approximately), so, how much is the minimum oxygen needed by the human body to not suffocate?. Maybe, 10%, 5% or 2%?

Thank you. :)


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