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Answer to Question #61163 in Molecular Physics | Thermodynamics for DEVENDRA SINGH

Question #61163
A reversible process can only be idealised and cannot be achieved in practice.
Expert's answer
Reversible processes actually do not occur in nature. They are merely idealizations of actual processes. Reversible processes can be approximated by actual devices, but they can never be achieved. That is, all the processes occurring in nature are irreversible.
The factors that cause a process to be irreversible are called irreversibilities. They include
• friction,
• unrestrained expansion,
• mixing of two gases,
• heat transfer across a finite temperature difference,
• electric resistance,
• inelastic deformation of solids, and
• chemical reactions.
The presence of any of these effects renders a process irreversible. A reversible process involves none of these.

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