Why does fire spread when we blow into it?

Question

Fire needs oxygen to burn, so why does it spread when we blow carbon dioxide into it?

In: Biology

Answer 1

You breath in 78% Nitrogen, 21% Oxygen, and 1% other stuff and gasses. You breath out 78% Nitrogen, 15% to 18% Oxygen, 4% CO2, and the remaining percent of other stuff and gasses. So most of what you breath out is Nitrogen and Oxygen. This is one reason why the “masks are bad for you” myth doesn’t hold up.