2.9 An aircraft is flying at an altitude of 12,000 meters (T=216.65 K, p= 0.193 bar) at a Mach number of 0.82. The cross-sectional area of the inlet diffuser before the L.P. compressor stage is 0.5 m". Determine: (a) the mass of air entering the compressor per second, (b) the speed of the aircraft and (c) the stagnation pressure and temperature of air at the diffuser entry. Ans. (a) 37.5 kg/s, (b) 871 km/hr, (c) 0.30 bar. 246 K.

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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.