Compressors, Gas Turbines and Jet Engines
The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

Rotor to static enthalpy rise in the stage
Rotor to static enthalpy rise in the stator
Stator to static enthalpy rise in the stage
Stator to static enthalpy rise in the rotor

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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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