124. Solving a chemistry problem

8. The results of Svedberg´s experiments to determine the average shift ∆ of platinum sol particles in different media at 293 K are as follows:
η*104, Pa*s τ,s ∆, µm
Acetone 3.2 1.6 6.2
Water 10.0 0.65 2.1
Propyl alcohol 22.6 0.45 1.3
Based on these data, determine the fineness of the sol particles, as well as the diffusion coefficients of particles in these media.