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

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

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Compressors, Gas Turbines and Jet Engines
In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

Turbine blades, which is a constant volume process
Turbine blades, which is essentially an isentropic process
Exit nozzle, which is a constant volume process
Exit nozzle, which is essentially an isentropic process

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