In an adiabatic irreversible process we know that q = 0. Now change in entropy is defined as q/T. So when q is zero, why is change in entropy not zero ?
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$\begingroup$ also: chemistry.stackexchange.com/questions/10706/… $\endgroup$– DavePhDFeb 20, 2015 at 19:01
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The change in entropy is the reversible heat flow divided by $T$. So if the process is irreversible, you can't use the irreversible process's heat flow to find the entropy change.
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$\begingroup$ So, how do you find entropy change in an adiabatic irreversible process ? $\endgroup$ Feb 20, 2015 at 18:52
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$\begingroup$ To find the entropy change in an adiabatic irreversible process, you need to figure out (i.e., identify) a reversible path between the same pair of initial- and final equilibrium states of the system (any reversible path will suffice) and calculate the integral of dq/T for that path. For more on this, see the following link: physicsforums.com/insights/… $\endgroup$ Jul 20, 2015 at 0:52