Esin and Markov coefficient

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.

$( ∂ E ∂ μ ) T , p , σ = − ( ∂ Γ ∂ σ ) T , p , μ$

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.

Source:

PAC, 1986, 58, 437 (Interphases in systems of conducting phases (Recommendations 1985)) on page 446