Frequently Asked Questions
What is the law of effusion?
The law of effusion states that the rate at which a gas escapes through a small opening is inversely proportional to the square root of its molar mass, so lighter gases effuse faster than heavier ones.
Why do helium balloons deflate faster than air balloons?
Helium has a very low molar mass, so by the law of effusion it escapes through the balloon material faster than the heavier nitrogen and oxygen molecules in air.
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