Activity of the Components of Binary Alloys of Alkali Metals: $\mathrm{Na}$–$\mathrm{K}$ System

The activity coefficients of the components of the$\mathrm{Na}$–$\mathrm{K}$ binary system are determined proceeding from the thermodynamic conditions of liquid-vapor equilibrium. The obtained data are in satisfactory agreement with the results of calculation of these activity coefficients by the pattern of the liquidus curve and using integral heats of mixtures of sodium-potassium alloys, as well as with the experimental data obtained by the emf method and by the effusion method.