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.




No comments:

Post a Comment

Understanding Stagnation point in pitot fluid

What is stagnation point in fluid mechanics. At the open end of the pitot tube the velocity of the fluid becomes zero.But that should result...