Question

The balloon stops rising up beyond a particular height when the density of gas inside the balloon :

• A. exceeds the density of air outside
• B. equal the density of air
• C. becomes less than the density of air
• D. none of these above

Answer 1

The correct option is B

equal the density of air

Explanation

1. A major factor in inflating a balloon is its density.
2. The balloon is filled with hydrogen gas that is less dense than atmospheric gas.
3. This difference in density causes the balloon to rise above the atmosphere.
4. However, as atmospheric pressure decreases with increasing altitude, the density of air begins to decrease as well.
5. There will be a point in the atmosphere where the density of the atmosphere is equal to the density of the gas inside the balloon. As a result, there is no difference in density, so the balloon stops rising.
6. Hence, the correct answer is equal to the density of air.

The correct option is (B).