How did people in ancient China explain the formation of lightning?

China had different views on the formation of lightning in ancient times. One is the "friction formation theory" put forward by Xu Shen, a native of Zhao in the Warring States Period (light and electricity are generated when Yin and Yang are sandwiched); One is the "explosive electrification theory" put forward by Wang Chong and others in the Eastern Han Dynasty. Wang Chong explained the lightning phenomenon with "a bucket of water poured on the fire of smelting and casting, and the gas cracked, if the sound of thunder was gone". In particular, he made a scientific explanation for the seasonal occurrence of lightning, thinking that "thunder is also excited by the sun, so how to understand it?" The sun moves in the first month, so it thunders in the first month. The sun is shining in May, and so is Lei Xun in May. Yang declines in autumn and winter, so thunder dives in autumn and winter. "The meaning of this passage is: Because the heat of the sun is gradually increasing in spring, there is the possibility of lightning. In summer, the sun has the strongest heat, so lightning is the strongest at this time. In autumn and winter, the heat of the sun weakens, and there is generally no lightning.