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. The (10[1])surface free energy equals the surface tension times this quantity. Catalysts like zeolites (10[1])have high values of this quantity due to 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]0[2])