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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Solution

This is due to the reason that balloons are not completely airtight. The air particles slowly diffuse through walls of the balloon or knot. Due to the high pressure inside the balloon, the flux is operating outside. This is the reason it slowly reduces and after a week all air goes out of the balloon.

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