Hot air balloon rises up because the air in the balloon _____________ on heating.
Complete the sentence with the correct option.

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expands

contracts

diminishes

first contracts and then expands

answer is A.

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Detailed Solution

When the air inside the balloon is heated, its molecules gain energy and move faster, causing the air to expand and become less dense. As a result, the heated air inside the balloon is lighter than the cooler air outside the balloon, which is dense. This creates a buoyant force that lifts the balloon off the ground and causes it to rise.

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