Question

Which of these CANNOT be done by blowing air from the mouth?

• A. Preventing ice cream from melting
• B. Cooling down a hot bowl of soup
• C. Warming up an icy cold milkshake
• D. Warming up hands in cold weather

Answer 1

The correct option is A Preventing ice cream from melting

A hot object can be cooled down by blowing air over it. However, blowing air on a cold object warms it up as the air from our mouth is hotter than the object.

• In winter, blowing air from our mouth can warm up our cold hands.

• When we blow air on a very hot object, like a boiling soup or a cup of hot milk, the air from the mouth cools it down.

• Similarly, the air blown from the mouth warms the cold objects, like a cold milkshake.

• Even though we want to prevent the ice cream from melting, blowing air on it will warm it and speed up the melting process.