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It needs to be open at the bottom to get heat from the burners into the balloon to warm up the air and decrease its density. If you sealed it off, eventually heat exchange through the fabric of the balloon would could the air off enough that the balloon would no longer be bouyant and it would lose altitute.

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What will happen to the air particles in a sealed balloon if it is cooled?

Cooling the air inside a sealed balloon will cause the air particles to slow down and lose energy, resulting in a decrease in pressure. As a result, the balloon will shrink in size due to the decrease in pressure exerted by the air particles on the balloon walls.


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