Entropy (conceptual)

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Entropy is a measure of?

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1. **Statistical Definition**: Entropy ($S$) is related to the number of microstates ($\Omega$) available to a system ($S = k_B \ln \Omega$).
2. **Qualitative Meaning**: It represents the degree of randomness or **disorder** in a system.
3. **Second Law Context**: The entropy of an isolated system always increases or remains constant ($dS \ge 0$).
4. **Physical Energy Interpretation**: Entropy also represents the amount of energy in a system that is 'unavailable' to do useful work.

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Entropy (conceptual)

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