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Liquid nitrogen (t= - 196^@ C) is inside...

Liquid nitrogen `(t= - 196^@ C)` is inside a Dewar vessel. The air surrounding the vessel has a temperature `t=20^@ C`. The pressure of the residual gas between the walls of the vessel is about `10^(-1)` Pa (roughly `10^(-6)`rnm fig). The mean free pa th of the "molecules" of air at atmospheric pressure is about `10^(-7)m`. What is the temperature of the air between the walls of the vessel?

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