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Practice each question, then open the answer or worked solution.
Have you warmed your hands in winter by blowing on them when they are cold? How does it feel?
Answer: Yes, blowing on my hands made my hands warmer in winter. It feels warmer and more comfortable.
Blow hard from your mouth onto your hands. How did you find the air from your mouth as compared to the air around you? Was it hotter or cooler?
Answer: Blowing hard from my mouth onto my hands, the air from the mouth was hotter than the outside air around me.
Now put your hands at some distance from your mouth, and blow again. Does the air from your mouth feel warm? Why?
Answer: When we put our hands at some distance from our mouth and blow the air from the mouth, we feel that the air is not warmer. Since the hand is kept far at a place, by the time the air blown from the mouth reaches the hand, it becomes cold by mixing with the air around.