Term: Esin and Markov coefficient
https://doi.org/10.1351/goldbook.E02218

Definition:
The left-hand side of one of the various cross-differential relationships that can be obtained from the Gibbs adsorption equation when only one chemical potential (µ) is considered as variable, viz. \[(\frac{\partial E}{\partial \mu })_{T,p,\sigma }=- (\frac{\partial \mathit{\Gamma }}{\partial \sigma })_{T,p,\mu }\] where E is the potential difference, T is the temperature, p is the pressure, Γ is the surface excess and σ is the charge density.

Related Terms:
1) gibbs adsorption (http://doi.org/10.1351/goldbook.G02627).
2) chemical potential (http://doi.org/10.1351/goldbook.C01032).
3) variable (http://doi.org/10.1351/goldbook.V06600).
4) surface excess (http://doi.org/10.1351/goldbook.S06171).
5) charge density (http://doi.org/10.1351/goldbook.C00988).

Source: PAC, 1986, 58, 437. 'Interphases in systems of conducting phases (Recommendations 1985)' on page 446 (https://doi.org/10.1351/pac198658030437)

Citation: 'Esin and Markov coefficient' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.E02218

License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms.

Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.