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

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

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Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Absolute discharge pressure to the absolute intake pressure
Gauge discharge pressure to the gauge intake pressure
Stroke volume and clearance volume
Pressures at discharge and suction corresponding to same temperature

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