Question

how are we able to blow hot and cold air from our mouth?

Answer 1

when we eat center fresh or mint we will chew we will blow an cold air from our moth whereas when we drink hot water we will blow hot air from our mouth
I hope it will help you

Answer 2

Answer:

It's all about evaporation. Blow through pursed lips, and your jet of streaming breath -- a bit of dry room air "entrained" along the way -- loses some of its own moisture. ... Evaporation from the skin temporarily decreases, and heat loss drops. And our skin feels warmer, like on a steamy day.