why it becomes difficult to breath in high altitude?

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Offline myriam

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does the concentration of the O2 is lower in high altitude ?
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Offline Bored chemist

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why it becomes difficult to breath in high altitude?
« Reply #1 on: 19/05/2010 20:47:06 »
Yes and no.
It's still about 21% of the air, but there's less air.
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