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New solubility data for methane, carbon dioxide, and their binary mixtures in pure water were obtained at 344.25 K and from 10 to 100 MPa. A thermodynamic model that combines a cubic equation of state (Peng−Robinson with k ij given in the literature) with the Henry's law approach has been elaborated. It has been shown that the (P,T) functional form of Henry's constant given by the Krichevsky−Kasarnovsky equation is applicable. It involves two important parameters: partial molar volume at infinite dilution and Henry's constant at the vapor pressure of water. Neither of these two parameters is a function of pressure or composition. The Henry's constant correlations of Li and Nghiem and Harvey, and the partial molar volume correlation of Lyckman et al. have been validated using a great number of solubility data.