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The speed of soundc in liquid metals and alloys is calculated using the perturbation theory of liquids and the pseudopotential theory of metals. An effective hard‐sphere diameter, as defined by the Gibbs‐Bogoliubov inequality, and its density dependence are determined for each metal from thermodynamic data. The structure independent contribution to c is calculated from the expression for cohesive energy given by Heine and Weaire [Solid State Phys. 24 (1970)]. The results, including the temperature and pressure dependence of c, are in quantitative agreement with experimental data.