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

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

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Compressors, Gas Turbines and Jet Engines
Water gas is produced by

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

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