Compressors, Gas Turbines and Jet Engines
Pressure ratio in gas turbines is the ratio of

Compressor pressure ratio
Inlet pressure to exhaust pressure
Pressures across the turbine
Highest pressure to exhaust pressure

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

Passing steam over incandescent coke
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

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