"Tang Shi" contains: "Li Yi was born in the fourth year of Tang Wude (AD 62 1) on April 18, and was born in the history of Lima in Yuanzhou Prefecture, Jiangnan West Road." Li Shimin, Emperor Taizong, was infatuated with Shan Gui, and long-term treatment failed, so he wrote to all parts of the country for medical treatment. At that time, Li Yiying, a 24-year-old cloth hunter, wrote a letter to expose the list. Based on the principle of soil hunting, he used a bamboo tube to pour nitrate to drive away the evil spirits of mandrills, so that the emperor's dragon body could be restored and he was named the founder of firecrackers.

Matters needing attention

Flame reaction has a serious disadvantage, that is, it usually requires high temperature. Therefore, the fireworks of the fireworks party have a high temperature. Generally, in this process, metallic combustible materials, such as aluminum and magnesium, are used to reach such temperatures. When aluminum burns, it releases a lot of heat and even melts iron (melting point is about 1500℃). Even if the residue of fireworks falls to the ground, the internal temperature can reach 300℃.

Therefore, it is very important to set a safe distance. However, as a part of China culture, fireworks have irreplaceable influence and spread all over the world. As long as it is used reasonably and transported, purchased, stored and set off according to the operating rules of fireworks, the danger of fireworks is completely controllable.