Air is compressed reversibly in a piston cylinder device from 0.10 MPa. 7oC to a pressure of 0.50 MPa. Calculate the heat transferred in kJ/kg, if the process is (a) polytropic with n = 1.3, (b) adiabatic and (c) isothermal.

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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.