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

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

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

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

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