The Effect of Pressure on Diffusion in Aqueous and Alcoholic Salt Solutions

Diffusion coefficients have been measured as a function of pressure to 10 000 atmos for the following aqueous solutions: 0.1 N Hg(NO3)2 at 0∘, 25∘, 50∘,75∘C,0.1 N CaCl2    at 25∘, 50∘C,0.1 N Ca(NO3)2 at 25∘C,0.1 N TlNO3    at 25∘C, and for 0.01 M HgCl2 in n‐butanol at 25° and 50°C. The results are interpreted in terms of the activation volume, and compared with previous data on water and sulfate solutions.