Abstract
A considerable amount of negative charge is seen produced on the surface of a silicone coated glass rod in repelling water. Experiment is made on the produced charge by repeating the process of immersing the rod in water, withdrawing it from water and measuring the amount of surface charge. From the analysis made on the behavior of the surface charge, the electrical state of the surface is surmised. One of the results that attracts interest is that when a substance of high water-repellent surface is left undisturbed in still water for some time, unusual increase of surface charge is observed when it is withdrawn out of water This is reasoned that, during the immersion, the air that was sucked in by the process of immersion and remained on the specimen surface and the gas molecules that were possively produced by the interaction between water and the specimen when immersed give rise to sizable bubbles, some of which escape out into the atmosphere, thus increasing the area of direct contact between the surface and water.
