Define about the bell jar, Physics

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Define about the Bell Jar?

A vessel with a small hole of diameter d in it is delegate inside a high-vacuum chamber. The pressure is so low that the signify free path λ>> d.

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The temperature of the gas in the chamber is T0, and the pressure is Po The temperature in the vessel is kept at a constant T1 =   4 T0.   What is the pressure within the vessel when steady state is reached?


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