Diffusion in Liquid Lead

The diffusion of lead and of trace amounts of bismuth in liquid lead have been investigated by the capillary method, using RaD and RaF as tracers. The results are compared with existing theories of diffusion in liquids, the agreement with theory being fair. The heat of activation for self-diffusion in lead is found experimentally to be close to the corresponding activation energy obtained from viscosity data. The pioneer data of Groh and von Hevesi for the self-diffusion of liquid lead, using ThB as a tracer, fit in with the present results.