Studies on gas-solid equilibria. Part V.—Pressure-concentration equilibria between silica gel and (1) oxygen, (2) nitrogen, (3) mixtures of oxygen and nitrogen, determined isothermally at 0º C

Experiments carried out on the adsorption of (1) pure oxygen, and (2) pure nitrogen by a sample of silica gel, at 0° C., and at pressures up to 1 atmosphere, have shown that the adsorption is directly proportional to the pressure in each experiment. The pressure-concentration isothermals are reproducible, completely reversible, and linear (except for a slight divergence at low pressures) throughout their whole length; there is therefore no sign of the silica gel approaching saturation with either oxygen or nitrogen at atmospheric pressure.