When zinc metaphosphate glass powders were mixed with water, the mixture of the glass powders and water was completely converted into translucent hydrogels. Electrical conductivities of the hydrogels, whose weight ratios of the mixtures of the glass powders and water were 1:0.5,1.1 & 1.2, showed 0.1,2.8 & 8.9mS/cm, respectively at 30C. The conductivities of the hydrogels increased and the activation energies for the electrical conduction decreased with increasing the water content in the hydrogels. Electric double layer capacitors (EDCs) were prepared using electrolytes consisting of the hydrogels. They showed no oxidation- reduction processes in the range of 0-1V. The specific capacities of the EDC cell for the glass derived hydrogels increased with increasing the water content in the hydrogels.
