A black or brown explosive is made of potassium nitrate, charcoal and sulfur by mechanical mixing. It is first made into powder and then generally made into particles of different sizes according to different uses. It was the only military propellant until smokeless powder was used.

Second, the historical evolution

Gunpowder was invented by an ancient alchemist during the Sui and Tang Dynasties in China, and it has been 1000 years. The study of gunpowder began with the ancient Taoist alchemy. The ancients refined Dan medicine to live forever. The purpose and motive of alchemy are advanced, but its experimental method still has some advantages, which eventually led to the invention of gunpowder.

Third, the application of gunpowder: flammable and explosive weapons

The trebuchet is the original gun, and it was thrown away at once. The first stone was thrown. Gunpowder also had a strong explosive ability in the Northern Song Dynasty.

Fourth, the application history of gunpowder

According to Lu Zhen's Records of Nine Kingdoms in Song Dynasty, during the year of (10th century), Zheng led an army to attack (now Nanchang, Jiangxi) and "set out" to burn the dragon shaman in the city. This may be the earliest record of siege with gunpowder.

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