Difference between Reversible and Irreversible Thermodynamic Processes

Question

Hey everyone! 👋 Ever get confused about reversible and irreversible processes in thermodynamics? 🤔 It's a common sticking point in physics. Let's break it down simply. Imagine ice melting perfectly versus a car engine working - both involve energy, but they're fundamentally different. Ready to explore why? Let's get started!

april_thompson · Accepted Answer

📚 Definition of Reversible Process
A reversible thermodynamic process is one that can be reversed without leaving any trace on the surroundings. Essentially, both the system and its surroundings can be restored to their initial states.

📚 Definition of Irreversible Process
An irreversible thermodynamic process is one that *cannot* be reversed without leaving a trace on the surroundings. These processes are spontaneous and natural.

🔬 Reversible vs. Irreversible Processes: A Side-by-Side Comparison

Feature
      Reversible Process
      Irreversible Process

Definition
      Can be reversed without any changes to the system or surroundings.
      Cannot be reversed without leaving a trace on the system or surroundings.

Equilibrium
      Occurs infinitely slowly, always in equilibrium.
      Occurs spontaneously and quickly; not in equilibrium.

Entropy
      No change in total entropy of the system and surroundings ($\Delta S = 0$).
      Total entropy of the system and surroundings always increases ($\Delta S > 0$).

Examples
      Idealized processes like frictionless expansion/compression, or a perfectly slow phase change.
      Real-world processes like combustion, diffusion, or any process with friction.

Practicality
      Theoretical concept; impossible to achieve perfectly in reality.
      Common and observable in everyday life and industrial applications.

Work Done
      Maximum work can be obtained.
      Work done is less than the maximum possible due to energy losses.

🔑 Key Takeaways

⏱️ Reversible processes are incredibly slow and idealized, maintaining equilibrium at every step.
    🔥 Irreversible processes are fast, spontaneous, and increase entropy, making them more realistic.
    💡 All real-world processes are, to some extent, irreversible. Reversible processes serve as theoretical limits for efficiency.
    📈 Entropy is the key indicator. If total entropy increases, the process is irreversible.
    ⚙️ While reversible processes are ideal for calculating maximum efficiency, irreversible processes are what we observe and deal with in practical applications.

Difference between Reversible and Irreversible Thermodynamic Processes

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1 Answers

📚 Definition of Reversible Process

📚 Definition of Irreversible Process

🔬 Reversible vs. Irreversible Processes: A Side-by-Side Comparison

🔑 Key Takeaways

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Feature	Reversible Process	Irreversible Process
Definition	Can be reversed without any changes to the system or surroundings.	Cannot be reversed without leaving a trace on the system or surroundings.
Equilibrium	Occurs infinitely slowly, always in equilibrium.	Occurs spontaneously and quickly; not in equilibrium.
Entropy	No change in total entropy of the system and surroundings ($\Delta S = 0$).	Total entropy of the system and surroundings always increases ($\Delta S > 0$).
Examples	Idealized processes like frictionless expansion/compression, or a perfectly slow phase change.	Real-world processes like combustion, diffusion, or any process with friction.
Practicality	Theoretical concept; impossible to achieve perfectly in reality.	Common and observable in everyday life and industrial applications.
Work Done	Maximum work can be obtained.	Work done is less than the maximum possible due to energy losses.