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Surface tension of the saturated Pb-Cu alloy and its contact angles on polycrystalline copper were measured at 390-800 and 390-1000C correspondingly. Surface tension and interfacial solid-liquid energies were calculated for Pb-Cu binary system by statistical thermodynamics on the basis of regular solution approximation at 390-1080 C. Calculated values coincide quite well with measured ones and with literature data at temperatures above 700 C.