why does a helium filled balloon become smaller after a few days
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why does a helium filled balloon become smaller after a few days
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The small atoms of Helium inside a balloon slips away in a balloon material causing it to deflate.
Answer:
The lighter helium gas molecules leave the balloon faster than the heavier nitrogen and oxygen molecules can enter the balloon. Over a period of time, the balloon shrinks! Odd as it may seem, had the balloon been filled with a gas heavier than the gases in air (argon, for example), the balloon would eventually expand.