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
Producer gas is produced by

Carbonisation of coal
Passing steam over incandescent coke
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing air and a large amount of steam over waste coal at about 65°C

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