Question

why the lighting see in the sky during the rainy season also involves in static electricity ?

Answer 1

In simplest terms, rain coms from condensed water vapor droplets we see as clouds, and each vapor droplet surrounds a dust particle and has an electric charge. Electricity tries to even out any difference in potential. Rain clouds sense these differences, call them positive or negative, and if they become different enough, electricity is released in a static charge, either cloud to cloud, or inside one cloud where - charged particles migrate to the bottom, and + to the top - or from cloud to ground. This last is called lightning, where the = from the ground travels toward a - charged cloud base, then the return stroke of - particles from the cloud cause the lightning which is most dangerous, and sets trees on fire, etc. Since the voltage is so high in the static charge, it travels around the outside of aircraft, causing no harm, in general. But if you are on the ground, you don’t even want to be in an area of + potential, because this is sensed by the - cloud base. Standing under trees in a thunderstorm is a bad idea.