It follows that dqrev − dq = dw − dwrev ≥ 0, or dqrev ≥ dq, and therefore that dqrev /T ≥ dq/T. Now we use the thermodynamic definition of the entropy (eqn 3.1; dS = dqrev /T) to write
It follows that dqrev − dq = dw − dwrev ≥ 0, or dqrev ≥ dq, and therefore thatdqrev /T ≥ dq/T. Now we use the thermodynamic definition of the entropy (eqn 3.1;dS = dqrev /T) to write