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

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

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Compressors, Gas Turbines and Jet Engines
In air compressors, free air delivery means the

Volume of air delivered by the compressor
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
Volume of air sucked by the compressor during its suction stroke
None of the listed here

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