Compressors, Gas Turbines and Jet Engines
Standard air is the air at

Atmospheric conditions at any specific location
0°C and standard atmospheric conditions
20°C and 1 kg/cm² and relative humidity 36%
15°C and 1 kg/cm²

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Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

Two adiabatic and two isobaric
One adiabatic, two isobaric, and one constant volume
One adiabatic, one isobaric and two constant volumes
Two adiabatic, one isobaric and one constant volume

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