Posted by Sam on Saturday, December 15, 2012 at 7:42am.
Hello I am trying to solve this physics problem related to effusion of gases.
The following data is given and I am asked to calculate the rate of effusion The data given;
depth/thickness (t)
Surface area (A)
diffusion coefficient (D)
Can someone help me out? The only law related is the Graham's Law but it compares two gases.
Thanks

Physics  drwls, Saturday, December 15, 2012 at 8:22am
I don't understand the question. Diffusion involves two gases, and you have not said what they are. Effusion is the rate that molecules flow through a hole that is smaller then the mean free path. I don't see how a depth would be involved. For effusion equations, see http://en.wikipedia.org/wiki/Effusion
The characteristic distance than a gas can diffuse into another gas in time t is sqrt(pi*D*t)
D is inversely proportional to pressure.

Physics  Sam, Saturday, December 15, 2012 at 8:38am
Its a balloon filled with the nitrogen gas balloon and its about the flow of nitrogen through a hole.
The thickness of the balloon, total surface area and the diffusion coefficient is given.
I am bit confused about the problem as well.
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