Air flows in a constant-area duct as shown in the figure. Assume Rayleigh line flow and the air to behave as a perfect gas with constant specific heats. For choked duct, determine: 1. Mach number at inlet (M1) 2. Stagnation temperature at inlet (To1) 3. Critical stagnation temperature (T,) 4. Mass flow rate 5. Heat input to choke the duct (q). q =?

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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.