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Why doesn't gas usually contract in volume?
A gas in some volume $V$ initially expands into a gas in volume $2V$. We say there is entropy increment of $(k_B)N\log2$ in this process. … This is the main idea of information conservation, I think, as stated in here
This seems to suggest that Entropy of gas which we know have expanded from volume $V$ is same as entropy of gas in volume $ …