question_answer

Asma took two balloons. She blew air with mouth in one balloon and she filled another balloon with the vapours of boiling water. She released the two balloons and observed that the balloon with the hot vapours rose higher than the other balloon. What did she learn from this experiment?

A)  Hot air is heavier than the cold air.

B)  Water vapour give energy to the balloon.

C)  Air likes hot balloons.

D)  Hot air is lighter and therefore rises higher.