Why entropy change in adiabatic irreversible process is not equal to z

1.	Why entropy change in adiabatic irreversible process is not equal to zero?
Answer» A classic EXAMPLE of an irreversible process causing entropy change not involving HEAT transfer is the free adiabatic expansion of an ideal GAS. ... Since the chamber is insulated, there is no heat transfer (Q=0). Since the expansion of the gas does not expand the BOUNDARIES of the chamber, there is no boundary work (W=0

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Why entropy change in adiabatic irreversible process is not equal to zero?

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