Change in Entropy (Reversible Process)

📊 advanced

$$\Delta S = \int \frac{dQ_{\text{rev}}}{T}$$

Definition of entropy change for a system during a reversible process.

Variables & Units

$\Delta S$

Entropy change

Unit: Joule/Kelvin ($J/K$)

$dQ$

Infinitesimal heat transfer

Unit: Joule ($J$)

$T$

Temperature

Unit: Kelvin ($K$)

Key Information

📐 Derived From

Clausius theorem.

💡 Example

Entropy change of melting ice.

🔧 Applications

Statistical mechanics and chemistry spontaneity.

⚠️ Constraints

Process must be reversible.

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