Define about the modified joule-thomson, Physics

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Define about the Modified Joule-Thomson?

Container A of variable volume V controlled by a frictionless piston immersed in a bath at temperature T.  This container is connected by a pipe with a porous plug to another container, B, of fixed volumeV1. Container A is primarily occupied by an ideal gas at pressure P while container B is primarily evacuated.

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The gas is authorized to flow through the plug and the pressure on the piston is maintained at the constant value P. While the pressure of the gas in B reaches P the experiment is terminated.  Abandon any heat conduction through the plug show that the final temperature of the gas in B is T1= (Cp/Cv) where Cp and Cv are the molar heats at constant pressure and volume of the gas.  


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