Question

The air that we breathe out is:

• A. Hot and contains water vapour
• B. Hot and does not contain water vapour
• C. Cold and contains water vapour
• D. Cold and does not contain water vapour

Answer 1

The correct option is A Hot and contains water vapour

Air blown out from our mouth is hot and it contains water vapour.
This can be proved by blowing the air to a mirror, which is cold. The water vapour in hot air that we breathe out turns into tiny droplets of water when it comes in contact with the colder mirror. This makes the glass moist and hazy. With this we can understand that the air that we blow out contains water vapour.