Good read 👌

Fun fact: you van use something similar to explain the law of ideal gasses:

PV=nRT

so if you increase Volume and keep the other variables constant, Temperature should increase. Now blow air out of your mouth with a small lip's aperture, and you get cold air; try the same with open lips and you get hot air.

Note: this is an oversimplification of the process, but the principle remains.

The English idiom "to blow hot and cold"

Can't say that I have ever heard this particular idiom, but I enjoyed reading the story of the satyr and the traveler. I agree with Voltaire.