What's the concentration level of oxygen in a standard medical oxygen gas which is normally found in ambulances or hospitals? Does it contain nitrogen too?
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1Posted this as a copy of a deleted question based on: https://meta.stackexchange.com/questions/189223/question-deleted-while-i-was-answering-it since the original question was deleted by the owner while I wrote an answer. – Bryan Krause Nov 14 '19 at 19:47
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Medical oxygen in liquid or compressed cylinders is typically >99% O2, but it is not typically administered at full strength. Instead, patients inspire a mixture of O2 and room air.
Oxygen concentrator units concentrate to 90-96%, which is called "93% oxygen". The remainder is mostly nitrogen.
Bryan Krause
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