n ideal gas of 0.12 m3 is allowed to expand isentropically from 300 kPa and 120°C to 100 kPa, 5 kJ of heat is then transferred to the gas at constant pressure. Calculate the change in entropy for each process. Assume γ=1.4 and Cp=1.0035 kJ/kg.K. if these two processes are replaced by a reversible polytropic expansion, find the index of expansion between original and final states. What will be the total changes in entropy?

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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.