State Function
| Also Known As | Thermodynamic state function, path-independent property, point function |
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What is State Function?
A thermodynamic property that depends only on the current state (pressure, temperature, composition) of a system, not on the path by which that state was reached. Examples include enthalpy (H), entropy (S), internal energy (U), and Gibbs free energy (G).
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
A thermodynamic property that depends only on the current state (pressure, temperature, composition) of a system, not on the path by which that state was reached. Examples include enthalpy (H), entropy (S), internal energy (U), and Gibbs free energy (G).
State functions are used in thermochemical calculations to determine energy changes for reactions without direct measurement. Hess's law exploits state function properties to calculate inaccessible enthalpies. Entropy and Gibbs energy as state functions underpin chemical equilibrium theory.
State function is a thermodynamic concept with no direct safety implications. However, thermodynamic calculations using state functions predict the feasibility and heat release of reactions.