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If air is blown into a balloon then it will be full of air.

If you want the balloon to float up then the gas you fill it with is not air but helium.

[However please note that if a helium balloon escapes, it may burst and fall back to earth over the sea where it can harm sea creatures (especially turtles) who try to eat them - so please do not purchase helium balloons]

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16y ago

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