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Consider a balloon filled with a gas . The pressure inside the balloon is same as the pressure outside it. Now it is pricked using a sharp needle. Will the gas come out of the balloon?

Consider a balloon filled with  a gas . The pressure inside the balloon is same as the pressure outside it. Now it is pricked using a sharp needle. Will the gas come out of the balloon?

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2 Answers

Khimraj
3007 Points
5 years ago
It will depend on gas inside the balloon as well outside.
If gas is same then gas will not come out of balloon.
and if they are different then The diffusion of gases will takes place according to Graham’s law i.e gases will diffuse at a rate inversely proportional to the square root of their molecular mass.
Aastha Singh
askIITians Faculty 212 Points
5 years ago
dear student,
IDEAL CONDITION – The pressure inside and outside the balloon always remains same, it is not to be mentioned. Had it not been the same, excessive pressure inside the balloon might have burst it or excess outside pressure might have compressed it.
It is this very reason that balloons either become limp after sometime or may even grow bigger, just to balance pressure inside and outside of the balloon.

REAL CONDITION – the pressure inside the balloon is considered more because even the tension (force) in balloon membrane appears to pull inwards, which imparts additional pressure on inside air.

the reason for gas molecules to flow out through hole is due to effusion(rushing through small holes), since gas molecules are very small and always in constant random motion, also confined in close space inside the balloon.

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