Select the correct option:
Hot air balloon rises up in the air because:
Select the correct option:
Hot air balloon rises up in the air because:
The correct option is B Hot air is lighter than cold air
The explanation for correct Option B: Cold air has a higher density than hot air, and that is why hot air balloons rise, it rises above the cold air.
The explanation for the incorrect Option A: Hot air is lighter than cold air. Cold air is heavier than hot air.
The explanation for the incorrect Option C: 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. Therefore it plays a significant role in rising the balloon.
The explanation for the incorrect Option D: As the air is heated inside the balloon it causes it to rise upwards (because it is lighter than the cooler air. Therefore water vapour has no role.
Concluding Statement: From the above reasons, Option B is the correct answer.
Hot air is lighter than cold air
The explanation for correct Option B: Cold air has a higher density than hot air, and that is why hot air balloons rise, it rises above the cold air.
The explanation for the incorrect Option A: Hot air is lighter than cold air. Cold air is heavier than hot air.
The explanation for the incorrect Option C: 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. Therefore it plays a significant role in rising the balloon.
The explanation for the incorrect Option D: As the air is heated inside the balloon it causes it to rise upwards (because it is lighter than the cooler air. Therefore water vapour has no role.
Concluding Statement: From the above reasons, Option B is the correct answer.
