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

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

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

Carbonisation of coal
Partial combustion of coal, eke, 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
Passing steam over incandescent coke

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