Helium gas at 25°C and 4 bars is contained in a glass cylinder of 100-mm inside diameter and 5-mm...

Question

Helium gas at 25°C and 4 bars is contained in a glass cylinder of 100-mm inside diameter and 5-mm thickness. What is the rate of mass loss per unit length of the cylinder?

David · Accepted Answer

Consider the diagram,
Inner diameter of the glass cylinder 100mm 0.1m   
Thickness of glass cylinder 5mm 0.005m   
Pressure A,1P 4 bar   
Temperature T 25 C 298K   
Binary diffusion constant for He in glass at 298K , 13 2MND 0.4 10 m / s
   
The solubility He in glass at 298K , 3 30.

Helium gas at 25°C and 4 bars is contained in a glass cylinder of 100-mm inside diameter and 5-mm thickness. What is the rate of mass loss per unit length of the cylinder?

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