A piston–cylinder device initially contains 15 ft3 ofhelium gas at 25 psia and 70F. Helium is now compressed ina polytropic process (PVn = constant) to 70 psia and 3008F.Determine (a) the entropy change of helium, (b) the entropychange of the surroundings, and (c) whether this process isreversible, irreversible, or impossible. Assume the surroundingsare at 70F.

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Q: A mass of 25 lbm of helium undergoes a process from an initial state of 50 ft3 /lbm and 60°F to a…

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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.