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
You do get some recycling in a stale room, but the air you exhale hasn’t been fully depleted of oxygen either.
Fresh air is 21% oxygen, and the air you exhale is 17%.
Gases do disperse very quickly (watch a smoker sometime) so you’re not just recycling the same quarter-lungful when you’re sitting down. Outside even a slight breeze will fully exchange the air in a second.
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