R-134a is throttled in a line flowing in at 20 °C, 655 kPa to a pressure of 400 kPa. What is the exit temperature ? Pin = 655kPa Tin = 20°C Answer: I Throttle °C < Pout = 400kPa Tout =?

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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.