A steady-flow, well-insulated turbine accepts steam at 4 MPa and 500°C with negligible kinetic and potential energy change, and exhausts at 100 kPa as saturated vapor. Calculate on a per-unit mass basis: (a) the actual work of the steam flowing through the turbine, (b) the entropy generation, (c) the quality x2s at the outlet if the process is reversible,

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.