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Because if you dont let some air out the carbon dioxide builds up inside of you and could make you pass out and drown. You're not blowing out to let out oxygen, you're blowing out to let out carbon dioxide

u can blow up by going to the sun then u POP

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15y ago

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after taking a deep breath in, your lungs are full of air. Air is lighter than water and so makes you float.

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15y ago
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Q: Why people float in swimming pool if they take a deep breath?
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