illustrates the pore size distribution (PSD)profiles of the silica aerogel and silica aerogel-activated car-bon composites synthesized by an ambient pressure drying(APD) method. A noticeable change has been observed in thePSD profiles of the silica aerogel and silica aerogel-activatedcarbon composites. It is known that the synthesized samplescontained mesopores (2–25 nm pores) and macropores (above50 nm) from pore size distribution graphs. Most pores of silicaaerogel known to be mesopores are below 20 nm and the peakof the smallest pore was 8 nm. Whereas most pores of silicaaerogel composites known to be mesopores are below about30 nm and their peak of smallest pore was 16 nm