My father recently began using an oxygen machine. He would like to know where the nitrogen goes when the machine takes in air and puts out only oxygen.


closed as off-topic by anongoodnurse, Tyto alba, another 'Homo sapien', David, kmm Apr 16 '17 at 23:59

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  • "Personal medical questions and health advice are off-topic on Biology. We cannot safely answer questions for your specific situation and you should always consult a doctor for medical advice." – David, kmm
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    $\begingroup$ I'm voting to close this question as off-topic because are OP doesn't show attempt at an answer. $\endgroup$ – Tyto alba Apr 15 '17 at 6:52
  • $\begingroup$ Did you try finding an answer? ' Provide details. Share your research. ' $\endgroup$ – Tyto alba Apr 15 '17 at 6:53

The nitrogen is returned to the air around the machine. See Wikipedia's article on the oxygen concentrator for details about how the machine separates the nitrogen and oxygen.


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