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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.
The fast-moving molecules of air trapped in the inflated balloon exert continuous pressure on the thin, stretched rubber sheet of the balloon and keep on diffusing out through it gradually. It is because the air molecules have the ability to diffuse through the surface. Therefore, the air escapes out of the balloon after some time.
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