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Party balloons typically deflate over time due to the natural permeability of the latex or material they are made from, allowing helium or air to escape slowly. Even when tightly tied, small gas molecules can seep through the microscopic pores in the balloon material. Additionally, the buoyancy of helium decreases as the gas slowly diffuses out, causing the balloon to sink. Environmental factors like temperature changes can also contribute to the balloon's loss of lift.

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AnswerBot

1w ago

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