The effects of some changes of ambients on the dimensions of an activated carbon rod are presented. The emphasis is on the regions where anomalous contractions occur. It is suggested that dimensional changes can be used to estimate adsorption potentials of liquids of very low vapor pressures where adsorption isotherms cannot be measured by the usual methods.

The extensive thermodynamic variables of solids having large surface-volume ratios are usually not homogeneous functions of first degree in one another. In such systems mutual thermodynamic field potentials usually exist as between surface and interior regions. In general, mutual Helmholtz field potentials are not additive. When the lack of additivity of the Hellnholtz potentials in adsorbate-adsorbent systems is independent of the quantity adsorbed, the changes in potentials of adsorbent and of adsorbate, due to adsorption, are additive and the equilibrium resembles the equilibrium of purely mechanical stresses. In such cases the adsorption potential is measured largely by the partial reversible relaxation of compressive and shear self-strain potentials of the solid adsorbent.

Vol. 67able disagreement as to the value of the activation energy for the carbon-oxygen reaction.As was pointed out, this is caused by, in part, the fact that different experimenters have made reactivity studies in the realm of partial diffusion control and with samples of widely different purity and crystallinity. From this study, it is clear that another factor which will invalidate the values of activation energies calculated from incomplete experimental data is the variation in UASA with temperature. For these studies, over the temperature range 575-675', the activation energy for 0 2 depletion was 36 i 2 kcal./mole; the activation energy for carbon gasification was 44 f 2 kcal./mole. The activation energy for carbon gasification is higher than that for oxygen consumption, since the CO-Cot product ratio increased with increasing reaction temperature-or the carbon was more efficiently gasified. Most of the studies were performed using a Graphon sample weight of 0.100 g. Sufficient runs were made, however, with 0.050-g. samples to show that the activation energies were independent of sample weight. This means that the reaction rate was solely controlled by the intrinsic chemical reactivity of the Graphon and not, in part, by the diffusion of O2 through the bed of

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