Engineering Physics Annotation << Back DEPENDENCE OF SURFACE TENSION AND DENSITY OF INDIUM-THALLIUM AND TIN-THALLIUM MELTS ON COMPOSITION AND TEMPERATURE R.A. KUTUEV The paper discusses the results of experimental studies of the surface tension (PN) and density (p) of In-Tl and Sn-Tl melts. Measurements were carried out in P.P.Pugachevich's gravity device by the method of maximum pressure in a drop, and a glass hydrometer was used to measure density. When measuring the temperature dependence of the density, the influence of capillary forces and thermal expansion of the hydrometer on the measured density value was taken into account. The density measurement error is 0.2, and the PN is 0.8 %. The experimental data obtained showed that the dependence of the density of tin-thallium and indium-thallium melts on the composition within the measurement error is linear. Isotherms of PN are characterized by smooth curves without singularities. At the same time, the extremes in the form of a minimum, previously discovered by other authors, are absent on the isotherms. It is shown that these minima at the PN isotherms are due to the fact that the specified authors used insufficiently pure metals for experimental measurements. The results of numerical modeling have shown that the theoretical isotherms qualitatively (the maximum deviations of theoretical data from experimental values do not exceed 3 %) describe the experimental data. According to the experimental data obtained, such surface properties as composition and thickness, molar and partial molar areas, adsorption of components (N-variant of Guggenheim and Adam adsorption) were calculated. Keywords: surface tension, density, modeling, isotherms, adsorption, molar and partial molar surface, concentration dependence. DOI: 10.25791/infizik.3.2023.1319 Pp. 57-62.