Absolute Entropy of a Substance
| Formula / Notation | S° |
|---|---|
| Also Known As | Standard molar entropy; Third-law entropy; S° (standard entropy) |
What is Absolute Entropy of a Substance?
The absolute entropy of a substance is the total entropy measured from absolute zero (0 K), where a perfect crystal has zero entropy according to the Third Law of Thermodynamics. It quantifies the degree of disorder or randomness in a system at a given temperature and pressure.
Formula & Notation
Other Names / Synonyms: Standard molar entropy; Third-law entropy; S° (standard entropy)
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The absolute entropy of a substance is the total entropy measured from absolute zero (0 K), where a perfect crystal has zero entropy according to the Third Law of Thermodynamics. It quantifies the degree of disorder or randomness in a system at a given temperature and pressure.
Calculating Gibbs free energy (ΔG = ΔH − TΔS); predicting spontaneity of reactions; thermochemical and thermodynamic calculations; standard entropy tables for reference
No hazard — purely a thermodynamic concept. Standard values are tabulated in reference books.
The formula or notation for Absolute Entropy of a Substance is: S°