Why does the way your mouth is open have an effect on the temperature of the breath you blow out?

Why does the way your mouth is open have an effect on the temperature of the breath you blow out?
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1 Answer

Answer :

I think it has to do with the speed of the air coming out of your mouth. Air from your lungs would be warmed to body temperature no matter what, but when it’s blown fast (through a tiny peephole), it feels cool to your skin because of evaporative cooling. When you open your mouth wide, the air comes out slowly, so you just feel the effect of the body-temperature warmth.
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