Viscosities of mercury-based dilute binary alloys containing 1∼3 at% Ag, Au, Zn, Cd, Ga, In, Tl, Sn, Pb and Bi have carefully been measured by an improved capillary method over the temperature range between their melting points and 230°C. In liquid pure mercury, the relation between logη and 1⁄T did not lie on a straight line over the entire temperature range measured, but the slope of the straight-line changed by about 8% at the temperatures in the vicinity of 70 and 150°C and decreased with increasing temperature. The viscosity of mercury increased at a rate of about 1∼5% with the addition of 1 at% solute, and the increasing tendency was considerably larger for Ag, Au and Pb but smaller for In, Cd and Sn. Bi showed a different behavior in the change of viscosity from the others. From the results of the present experiment, it becomes manifest that an equation for the viscosity of dilute binary alloys can be approximately expressed in terms of the square root of the product of the atomic weight by the melting point of solute as a parameter.
