The first observation is that the water entropy in both 1WL and IBL is larger than in the bulk water (0.55 meV/K per water molecule). This is due to the more pronounced translational contributions at the interface as shown in Figures and. Au and Ag have the highest 1WL entropies, which likely results from the relatively unorganized water structure (Figure ) and high water diffusivity 89 in the 1WL. Pd-Au and Pt TABLE I. Computed thermodynamic quantities for the metal-water interfaces. γ sv is the solid-vacuum surface tension based on the free energy. S H 2 O is the average entropy per water molecule in the sl model. γ sl (E) and γ sl (F) are the solid-liquid surface tensions based on the internal energy and free energy, respectively. ∆γ sl (S) is the entropic contribution to the surface tension computed using Eq. ( ). W ad is the work of adhesion by Eq. ( ), F solv is the free energy of surface solvation referenced against bulk water and the metal surface by Eq. (10), and θ sl is the metal-water contact angle. The units are meV/K for the S H 2 O and meV/Å 2 for the γ i at 298 K. The contact angles θ sl are given in degrees. The liquid-vacuum surface tension is γ lv = 4.46 meV/Å 2 . The uncertainties for the sl free energies, surface tensions, adhesion works, and solvation free energies are ±2 meV/Å 2 . The entropy uncertainty for the sl system is ± 0.01 meV/K. have the lowest 1WL entropies close to the bulk value. On Pt, both the 1WL and IBL entropies are similar and small, which can be understood by the high water diffusion barrier on the surface and the relatively structured, rigid interfacial water. Rh has a large 1WL and the smallest IBL contribution, which can be understood by the facile water diffusion in the 1WL despite the very structured water in this region. The highest IBL entropies are found for Pd and Au. Since the number of water molecules in the IBL region is significantly higher than in the 1WL, IBL dominates the sl interface formation entropy. It appears that the highly exergonic solvation of Pd is a result of a modest water adsorption strength and high IBL entropic contributions.