A piston cylinder device contains 0.15 kg of air initially at 2 MPa and 350 C. First, the air expands polytropically to a pressure of 500 kPa with a polytropic exponent of 1.4. Then, it is compressed isothermally back to the initial pressure (2 MPa). Find the change in entropy between the initial and final states. Express it in kl/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.