Air compression (or expansion) can occur under isothermal, adiabatic, or polytropic conditions.
The isothermal compression process takes place under constant temperature conditions.
When a volume of air in a system is compressed or expanded instantly, there is no time to add or dissipate heat into or out of the system, and the process is said to be adiabatic.
These compression processes are considered theoretical and are presumed to be taking place under ideal conditions.
In practice, air compression occurs between the two limits of compression. The polytropic compression process represents the true compression process in compressors.
Joji Parambath
Director
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Bangalore, India
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