Question

Sonu was feeling very cold. He kept blowing on to his hands. Why did he do that ?

• A. Sonu's breath was hotter than his skin (particularly on a cold day). By blowing, he transfer energy from inside his body to hands by convection.
• B. Sonu's breath was cooler than his skin . By blowing out this cooler air out, Sonu felt warmer inside
• C. Sonu's exhales out cool air and breathes in the air in the atmosphere which is relatively warmer and thus feels warm.
• D. None of the above

Answer 1

The correct option is A Sonu's breath was hotter than his skin (particularly on a cold day). By blowing, he transfer energy from inside his body to hands by convection.

Sonu’s hands will be cooler than his breath. He used the warmer air coming out of his mouth to warm his cold hands.