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
This question appears to be off-topic. The users who voted to close gave these specific reasons:
- "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
- "Homework questions are off-topic on Biology unless you have shown your attempt at an answer. For more information see our homework policy." – anongoodnurse, another 'Homo sapien'
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.