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?
In: 14
It mixes with the rest of the air so it’s not 100% what we breathed out, but there’s a decent component of it.
Regardless, though — we actually exhale _most of the oxygen we inhale_. You don’t consume all the oxygen you breathe in. Air you inhale is about 20% oxygen, and air you exhale is about 14% oxygen.
This is why you can give people mouth-to-mouth resuscitation, BTW (and yes I know that’s no longer recommended).
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