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

Absolute discharge pressure to the absolute intake pressure
Stroke volume and clearance volume
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
For minimum work in multistage compression, assuming same index of compression in all stages

Work done in first stage should be more
Work done in subsequent stages should decrease
Work done in subsequent stages should increase
Work done in all stages should be equal

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