Compressors, Gas Turbines and Jet Engines
In n₁ and n₂ are the indices of compression for the first and second stage of compression, then the ratio of work-done on the first and second stages (W₁/W₂) with perfect intercooling is given by

W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)
W₁/W₂ = n₂/n₁
W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)
W₁/W₂ = n₁/n₂

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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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