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The air we inhale is roughly 78% by volume nitrogen, 20% oxygen, 1% argon and 0.04% carbon dioxide, helium, water vapour, and small amounts of other gases. The gases we exhale are essentially the same except that there is an increase (roughly 4% to 5%) in carbon dioxide and 5% to 10% less oxygen than was inhaled. Low quantities of other gases and compounds like ethanol (more if alcohol has been drunk) are also exhaled.

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14y ago
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Q: When you breathe out what gas do you produce?
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