Résumé : Electrocapillary measurements in NaF aqueous solution at the Hg electrode are reported. Charge densities obtained by the coulostatic technique in the case of 10-1 mol kg-1 mol kg-1 aqueous NaF solution at 15, 25, 35 °C agree well with values measured by the bridge method (for 10-1 mol kg-1) and conform with calculated valued based on the Gouy-Chapman model. Results of surface tension are obtained by means of the maximum bubble pressure technique. Comparison is made between these results and data derived from coulostatic measurements. The partial molar surface entropies of water in function of the density of charge are computed from the temperature coefficients of the surface tension. © 1974.