Abstract
The product σχ T m of surface energy σ and isothermal compressibility σχ T m for liquid metals at the melting temperature T m yields a length l ranging from about 0.2 to 0.5 Å over the entire range of liquid metals. The variation of l, which has been related brfore to the thickness of the liquid-vapour interface, is shown to be accurately represented by l=c[S T m (0)/NK B T m ] 1 2 , where the constant c is determined empirically, K B and N being the Boltzmann factor and Avogadro's number respectively, and S T m (0) the bulk liquid structure factor in the long wavelength limit at the melting temperature. A microscopic interpretation of l is proposed.
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