Friday, 14 September 2018

heat - Why does the air we blow/exhale out from our mouths change from hot to cold depending on the size of the opening we make with our mouth?


Why does the air we blow/exhale out from our mouths change from hot to cold depending on the size of the opening we make with our mouth?


It's not just a subtle difference, but significant in my opinion. I'm inclined to discredit the notion that it's just a matter of speed because I can blow fast with an open mouth and still, it's hot; and blow slow with an almost closed (tighter) mouth and again, it's cold.




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