21. Plot an adsorption-desorption isotherm using the experimental data of capillary condensation of water vapor in the pores of active carbon at 293 K.

p • 10-2, Pa 5.32 10.0 11.3 12.5 14.7 17.3 20.0 23.3
A, mol/kg ads. 0.5 2.3 4.0 5.0 10.0 16.0 20.0 28.5
A, mol/kg des. 0.5 2.5 5.0 7.5 15.0 23.0 27.6 28.5
Calculate and plot the integral curve of pore volume distribution by size. The molar volume of water is 18 cm3/mol; its saturated vapor pressure is 2338 Pa; surface tension 71.96 mJ/m2.

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