When the mouth of an inflated balloon was left open, the entire air that was blown into the balloon escapes. This is because of

acceleration due to gravity

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air pressure difference

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air inside was hot

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air inside was cold

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Solution

The correct option is B air pressure difference
When a balloon is inflated with air and its mouth is closed, the air pressure inside it will be more as compared to the air pressure outside. When the mouth of the balloon is opened, due to this air pressure difference, the air molecules start moving from a higher pressure region to a lower pressure region. Hence, the air that was blown into the balloon will escape.

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