Solve
Guides
Standard XI
Physics
Thermal Expansion
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 vapors which push the balloon up
D
None of the above
Open in App
Solution
Verified by Toppr

Correct option is B. Hot air is lighter than cold air
Hot air rises up because it is lighter than cold air. As the air inside the balloon is hotter than the air surrounding the balloon it rises up.

Was this answer helpful?
0
Similar Questions
Q1

A hydrogen balloon rises in air because


View Solution
Q2

Hot air always rises up.

View Solution
Q3

Ventilators are provided near ceilings in the rooms of our houses because:
1. Hot air is lighter than cool air.
2. Hot air rises up and cool air settles down.
3. Hot air is heavier than cool air.

View Solution
Q4

How do hot air balloons rise up in the air? [3 marks]


View Solution
Q5

(a) Why does hot air rise up?
(b) How does a hot-air balloon work? [3 MARKS]

View Solution
Solve
Guides