an organic non aqueous system for the inorganic system 30 wt of sulfuric acid reagent grade in deionized water was used as the electrolyte the results are set forth in table 4 below the capacitance per unit area is calculated by dividing the mass specific capacitance by the value of the surface area see table 1 with the results as follows in table 5 in order to inspect the ultracapacitor 39 s ability to quickly discharge its stored energy a cac material processed at the 800 u00b0 c and 3 ksi for 1 hour capacitor was subjected to discharge at various current densities the capacitance measured for each discharging condition is listed in table 6 the energy density of the ultracapacitors was calculated to be higher than 7 wh kg based on electrode materials only and 3 5 wh kg if one takes into account the weight of the electrolyte separator and current collector the peak power density of the capacitors was estimated using a transient method for material with a density of 0 75 g cm 3 a 2 cm 2 u00d7 0 1 cm electrode weighs 0 15 g and a total of 0 3 g of electrode material was used for the cell a power density based on the cac electrode material is estimated to be 23 kw kg this performance is made possible by the unique pore size distribution and the high conductivity of the cac material turning now to the organic system since the break down voltage of an organic electrolyte is much higher than an aqueous electrolyte a higher operating cell voltage can be achieved by using an organic electrolyte for the organic system propylene carbonate pc alfa.