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Statement of a problem № 623

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A vessel filled with gas is divided into two equal parts 1 and 2 by a thin heat-insulating partition with two holes. One hole has a small diameter, and the other has a very large diameter (in comparison with the mean free path of molecules). In part 2 the gas is kept at a temperature ii times higher than that of part 1. How will the concentration of molecules in part 2 change and how many times after the large hole is closed?

Solution:
A vessel filled with gas is divided into two equal parts 1 and 2 by a thin heat-

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