Solution:
As the entire system is thermally insulated, no heat exchange occurs with the surroundings ($Q = 0$). Therefore, the free expansion process is adiabatic.
Two cylinders A and B of equal capacity are connected to each other via a stop cock. A contains an ideal gas at standard temperature and pressure. B is completely evacuated. The entire system is thermally insulated. The stop cock is suddenly opened. The process is: (2020)
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