The ratio of this quantity to its “apparent” value defines a quantity symbolized r in the Wenzel and Cassie-Baxter models. Materials with very high values of the specific form of this extensive quantity, like NU-110 and DUT-60, can be activated with supercritical CO2. This quantity can be determined by injecting nitrogen into a sample cell at several different pressures, and then using the B·E·T isotherm. The increased capacitance of EDLCs is due to high values of this quantity for (*) activated carbon electrodes. (10[1])The surface free (10[1])energy equals the surface tension times this quantity. Catalysts like zeolites have high values of this quantity due to (-5[1])their extensive pore networks giving them more sites for reactions to occur. For 10 points, give this quantity that measures the space available for molecules to adsorb. ■END■ (10[1])