The reason for breathing in through your nose and out through your mouth
In: Biology
Your nose is smaller than your mouth.
To elaborate, your lungs need time to make use of oxygen. If you breathe in and out very fast, your lungs don’t do their job very well. Hyperventilating will make you pass out.
Breathing IN through a tiny hole ensures that your lungs get time to get oxygen from the air you’re breathing. Breathing OUT might as well happen as fast as possible, so a larger exit is used.
In through your nose goes slow, out through your mouth is fast. Doing it in reverse wouldn’t work as well.
Also your nose moisturizes air, while your mouth would dry out from too much air.
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