Step-by-step explanation:
We know that a irreversible process is a process in which if we reverse the process then final and initial process would not be same. Because it leaves the some effect on the external environment.
In real it is impossible to achieve a reversible process.Generally all processes are irreversible process.
Irreversibilities in compression can be due to
1.Piston friction (relative motion)
2.Due to heat transfer or due to temperature difference between compressor and surrounding.
3. Due to unrestrained compression