We don’t breathe out with much force, and even if we did, we immediately inhale. So, how do we not just inhale what we just exhaled?
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We do “reuse” a bit of air with each breath, but we don’t use up 100% of the oxygen with each breathe and we don’t breathe out 100% CO2 either. You can actually 100% rebreathe the same breathe several times and be perfectly ok, they use this concept for some SCUBA technologies to extend how much air you carry.
In case it’s your next question, it’s actually better for us to “keep” a bit of air with each breathe because our lungs don’t “re-open” very well, they work best when they’re already open a little bit. If you lung got 100% empty, you’re probably not be able to reopen them and you’d suffocate to death.
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