Compressors, Gas Turbines and Jet Engines
A 3 m³/min compressor means that it

Compresses 3 m³/ min of free air
Delivers 3 m³/ min of compressed air
Compresses 3 m³/min of standard air
Delivers 3 m³/ min of compressed air at delivery pressure

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

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

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