Fire needs oxygen to burn, so why does it spread when we blow carbon dioxide into it?
In: Biology
When you breathe out you’re not just breathing out carbon dioxide. You’re lungs are pretty good at getting co2 out and o2 in, but they do not pull 100% of the oxygen out of the air you breathe in in one go. So when you breathe out you’re still breathing out, blowing, a bunch of oxygen.
Also, that stream of air you’re blowing out is going to interact with the air outside and push Some of it along too.
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