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 T_0, and the pressure is P_o The temperature in the vessel is kept at a constant T₁=4T₀.What is the pressure within the vessel when steady state is reached?

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