The density of liquid sodium-potassium eutectic

The experimental investigations of the density of molten sodium-potassium alloys of eutectic composition, described in the literature, are briefly reviewed. This review is used to estimate the confidence error of the measurement results. The least squares method is used to simultaneously process the entire body of the experimental data on the density of the liquid $\mathrm{Na}$–$\mathrm{K}$ eutectic. An approximating equation is derived for the temperature range from the melting point of the sodium–potassium eutectic to $1300$ K. The mean-square error of the calculated values of the density of $\mathrm{Na}$–$\mathrm{K}$ eutectic melt in the given temperature range is determined.