who can proof that oxygen present in air
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Light a match. Combustion as it is defined, requires oxygen.
Or just sit and wait 3 minutes. Keep breathing. After 3 minutes, if you are still concious, there is definitely oxygen present.
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Or just sit and wait 3 minutes. Keep breathing. After 3 minutes, if you are still concious, there is definitely oxygen present.
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Because we can breathe in air
without it we can't and it is one of the main reasons of respiration.
without it we can't and it is one of the main reasons of respiration.
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