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

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

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of compressor is defined as the ratio of

Power to drive compressor to isothermal h.p.
Isothermal h.p. to adiabatic h.p.
Isothermal h.p. to the BHP of motor
Work to compress air isothermally to work for actual compression

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