Who invented explosives?

Nobel invented explosives, which originated in China. At the latest in the Tang Dynasty, China invented gunpowder (black dynamite), which is the earliest explosive in the world. In Song Dynasty, black dynamite had been used in war, which needed an open flame to ignite, and the explosion was not effective.

The explosion of explosives is influenced by certain external excitation impulse. Detonation is an explosion phenomenon when the propagation speed of chemical reaction zone in explosives is greater than the sound speed in explosives, and it is a typical form of energy release of explosives. The explosion is actually divided into two stages. Most of the damage was caused by the initial expansion. It will also create a low pressure area around the explosion source, and the gas will move outward quickly, thus sucking most of the gas from the "center" of the explosion. After the outward impact, the gas rushes back to the center of partial vacuum, forming a second inward energy wave with less destructive power. Because the chemical reaction speed is very fast when the explosive explodes, high temperature and high pressure gas is formed in an instant. With extremely high power (the instantaneous output power per kilogram of explosive detonation can reach 5×1 kW), the surrounding medium is subjected to strong impact and compression, resulting in deformation or fragmentation.