Stefan's formula

For the formula describing ice formation, see Stefan's equation.

In thermodynamics, Stefan's formula says that the specific surface energy at a given interface is determined by the respective enthalpy difference $\scriptstyle \Delta H^{*}$.

$\sigma =\gamma _{0}\left({\frac {\Delta H^{*}}{N_{\text{A}}^{1/3}V_{\text{m}}^{2/3}}}\right),$

where σ is the specific surface energy, N_A is the Avogadro constant, $\gamma _{0}$ is a steric dimensionless coefficient, and V_m is the molar volume.