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| Q. |
A balloon filled with helium rises in air because – |
| A. | air exerts an upward force on the balloon |
| B. | the balloon is weightless |
| C. | helium is less dense than air |
| D. | helium pushes down on the air below the balloon |
| Answer» C. helium is less dense than air | |
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Explanation: A gas balloon is any balloon that stays aloft due to being filled with a gas less dense than air or lighter than air (such as helium or hydrogen). A gas balloon may also be called a Charliere for its inventor, the Frenchman Jacques Charles. Today, familiar gas balloons include large blimps and small rubber party balloons. Blimps have displaced zeppelins (which are not balloons) as the dominant form of airship. as balloons remained popular throughout the age before powered flight. |
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