Dielectric relaxation of some sphercidal molecules

In the course of the investigation of the relations between microwave absorption and molecular structure in liquids, a question arose as to the effect of dipole orientation, in non-spherical molecules, on relaxation time. In order to investigate this effect, the critical wavelengths and viscosities of trioxane, pyridine, paraldehyde and collidine were measured at a number of temperatures. The results at 60°C. are given in the following table.