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2015-02-20T20:14:31+08:00

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I think it's oxygen.
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2015-02-21T12:13:28+08:00

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It's the Oxygen about 21 % close to one- fourth of the air surrounding air.

about 78 % close to four- fifths are nitrogen gas (Nitrogen) and small amount about 1% of air composition  are other gases and molecules such as
Carbon dioxide, Helium, Neon, Hydrogen, Methane and others

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