A hot gas flowing through a pipeline can be considered an Irreversible process.
Irreversible process
Irreversible processes represent real-world procedures that take place throughout a finite amount of time and include real elements with intrinsic temperature, pressure, as well as velocity fluctuations that cause power dissipation, including viscous.
Those would be the alterations during which the substance cant 'be restored to its natural position.
For illustration, fuel combustion, and so on.
Thus option b is correct.
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