(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A thin-walled container of volume 10−3 m3 is evacuated to a pressure of 10−7 mbar. The vessel is surrounded by air at 1 bar and 290 K. If a small hole of area 10−17 m2 is made in the wall of the container, how long does it take the pressure inside to rise to 10−6 mbar?

2. Relevant equations

3. The attempt at a solution

##\frac{dN}{dt}=A\phi = \frac{A<v> N}{4V}##

## \frac{dN}{N}=\frac{A<v>}{4V} t ##

##t=\frac{4V}{A<v>}\ln{\frac{P_2}{P_1}}##

However this requires us to know m and i can't see how to figure this out. Therefore i am assuming my solution is wrong....

Many thanks in advance

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# Homework Help: Effusion changing pressure

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