Question

Hot air balloon rises up in the air because:
A) hot air is heavier than cold air
B) Hot air is lighter than cold air
C) Hot air contains water vapours which push the balloon up
D) None of the above

Explain ​

Answer 1

Answer:

Hot air rises up because it is lighter than cooler air. As the air inside the balloon is hotter than the air surrounding the balloon it rises up.

So, option (b) is the correct answer.

hope it helps you.

Answer 2

Answer:

ans- D. None of the above .