A process that cannot be retraced back to its original position even after the system passes through the same intermediate states called irreversible process.
All the spontaneous and natural processes are irreversible processes.
Some more examples for irreversible process are
1. Work done against friction
2. Joule-heating-heat produced in a conductor by passing a current through it
3. Diffusion of gases
4. Magnetisation of a material.
Heat engines working between the given temperatures of source and sink, the engine working in reversible process have the highest efficiecy.
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