Air in a piston expands from 8 MPa to 150 kPa. The initial piston volume and temperature are 0.05 m3 and 750°C. If the temperature is held constant, (a) how much heat is transferred in kJ and (b) what is the entropy change in kJ/K?

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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.