16. Two pounds of air at 100 psia occupy expands at a constant pressure until its volume is increased 300. per cent; after that the air expands adiabatically to 50 psi, and finally its pressure is reduced isochorically to 15 psi. Determine the changes of available and unavailable energy and of the entropy between the starting and final condi- tions. Assume the refrigerator temperature to be 70 F, and use everage specific heats for the temperature range involved. air. 18

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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.