632.    ---------------.  [COURTY, C.]  [On the Evolution of the Magnetic Properties of Oxygen Adsorbed on Activated Charcoal Which Has been Activated in a Vacuum at Elevated Temperatures.]  Compt. Rend., vol. 230, 1950, pp. 1588-1589; Chem. Abs., vol. 44, 1950, p. 10, 403.

      The coefficient of magnetization was calculated for O₂ adsorbed on charcoal activated in a vacuum and at elevated temperatures.  This same measurement had been previously carried out on charcoal activated in a vacuum in the cold.  In this experiment the charcoal was activated in a vacuum of 0.02 mm. for 6 hr. at 900°.  When this charcoal was put into contact with O₂, the adsorption was accompanied by the release of a great amount of heat, 5.6 cal.  This was attributed to the formation of CO₂.  It was found that the decrease in the paramagnetism is of the same order for C that has been activated either in the cold or at high temperatures.

     COUSSEMANT, F.  See abs. 1648.

     COWAP, M. D.  See abs. 2304, 2305.

     COWARD, H. F.  See abs. 292, 293, 294.