Compressors, Gas Turbines and Jet Engines
Free air is the air at

15°C and 1 kg/cm²
20°C and 1 kg/cm² and relative humidity of 36%
0°C and standard atmospheric conditions
Atmospheric conditions at any specific location

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Compressors, Gas Turbines and Jet Engines
The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

Increase first at slow rate and then fast
Decrease continuously
Increase first at fast rate and then slow
First increase, reach maximum and then decrease

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