AbstractsChemistry

Measurements have been made to determine if the amount of dimethylether sorbed on alumina, under the same conditions of temperature and bulk phase density, depends upon its thermal history. It would be expected on the basis of the orientation hypothesis that the sorption would "be changed by destroying the residual liquid structure which persists above the critical temperature. Within the limits of experimental error, however, no difference could be detected. The variation of sensitivity of quartz spirals used for weighing has been investigated, and an equation has been deduced for making suitable corrections. It was also found that the sensitivity varies with the weight suspended on the spiral, but to a much smaller extent. Measurements made with several spirals having different sensitivities indicated that the correction factors are practically independent of the sensitivity within limits, and that the average value of these constants may be used with a considerable degree of accuracy. (...)