Density and Viscosity of Thallium Amalgams

The densities of thallium amalgams were measured at 25, 50, 70, 90,105, 125, and 160 °C over the concentration range 0 to 42% thallium by weight and the results were fitted to equations of the form d = a + bx + cx2, where d is the density in grams per ml, a, b, and c are constants and x is weight % thallium in the amalgam. The coefficient of expansion was calculated for the temperature range 25 to 90 °C. Viscosities relative to mercury were also determined over the same range of composition and at the same temperatures as were used in the density measurements. Equations were presented which show the variation of viscosity with composition and also the variation of viscosity with temperature.