The paper by Ph. Buffat and J.-P. Borel investigates the size effect on the melting temperature of gold particles using a scanning electron-diffraction technique. The authors measure the melting points of gold particles with diameters ranging from 50 Å to 20 Å, focusing on the size distribution and experimental methods. They compare their results with two phenomenological models: one assuming the coexistence of a solid particle, a liquid particle, and a vapor phase, and another assuming a liquid layer surrounding the solid particle. The first model predicts a linear relationship between the relative lowering of the melting temperature and the surface curvature, while the second model includes nonlinear terms. The experimental results are in good quantitative agreement with both models, but the second model requires the assumption of a liquid layer with a thickness of about 6 Å. The study also discusses the implications of these findings for the structure of small particles and the existence of a liquid surface layer.The paper by Ph. Buffat and J.-P. Borel investigates the size effect on the melting temperature of gold particles using a scanning electron-diffraction technique. The authors measure the melting points of gold particles with diameters ranging from 50 Å to 20 Å, focusing on the size distribution and experimental methods. They compare their results with two phenomenological models: one assuming the coexistence of a solid particle, a liquid particle, and a vapor phase, and another assuming a liquid layer surrounding the solid particle. The first model predicts a linear relationship between the relative lowering of the melting temperature and the surface curvature, while the second model includes nonlinear terms. The experimental results are in good quantitative agreement with both models, but the second model requires the assumption of a liquid layer with a thickness of about 6 Å. The study also discusses the implications of these findings for the structure of small particles and the existence of a liquid surface layer.