An inflated balloon full of air goes dow...

An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.

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The correct Answer is:

The fast moving molecules of air trapped in the inflated balloon exert continuous pressure on the skin, stretched rubber sheet of balloon and keep on diffusing out gradually through it.

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