C. Air (ideal gas) is contained in a piston/cylinder arrangement, that can exchange heat with a reservoir at a temperature of 25 °C. The amount of air is 1 kg and it is initially at a temperature of 25 °C and a pressure of 105 kPa. Then air is isothermally compressed to a pressure of 300 kPa.

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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.