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How can I measure oxygen content in the air?

Asked by dabbler (18896points) November 5th, 2011

Let’s say the room you sleep in has all the windows and doors(s) closed at night. Has the oxygen content in the air of the room dropped significantly, or even measurably, overnight? How could that be measured ? Are there inexpensive lab machines that can determine gas distributions in the air? Are there simpler methods?

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