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Physgeek64
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Homework Statement
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?
Homework Equations
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