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Breathing is less about weight/mass/gravity, and more about pressure. You breathe in because your diaphragm contracts and pulls down, creating a lower pressure in your lungs. Air from outside the body rushes in to the lungs. (Things in nature try to reach balance or equalibrium, thus things in high pressure will want to balance out things in lower pressure.) Gravity has very little to do with air pressure.

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16y ago

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