Two pistons having low thermal conductivity divide an adiabatic container in three equal parts as shown. An ideal gas is present in the three parts A, B \& C having initial pressures as shown and same temperatures. Now the pistons are released. Then the final equilibrium length of part A after long time will be

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n = RT P V ​ ; final pressure and temperature are the same in all three parts, so final volumes are in the ratio of moles P : 2 P : P = 1 : 2 : 1 . Part A gets 4 1 ​ of total volume, i.e. length L /4 .

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