It was already used in China in the Spring and Autumn Period for folk and livelihood applications.

Gunpowder is one of the four great inventions of China. It is a substance that can burn rapidly and regularly under the action of appropriate external energy, and generate a large amount of high-temperature gas at the same time. In the military is mainly used as gunshot, artillery shells launching charge and rockets, missiles propellant and other driving device energy, is an important part of the ammunition. An outstanding achievement in the history of human civilization. Gunpowder is with its lethality and deterrent effect, bring mankind to stop the war, security and defense role, has become one of the important inventions of human civilization.

The first book on gunpowder formula that we can see now was written in the 8th or 9th century. The book said, "sulfur, andrographis combined with saltpeter, and honey burned", the phenomenon will occur "flame up, burning hands and face and fire all the houses". The "honey" here should be the "honey" of honey. Honey turns into charcoal when heated. Sulfur, saltpeter and charcoal are mixed together, and this is the recipe for gunpowder.

Classification of gunpowder

Gunpowder is the energy source for weapons to fire projectiles, which can be classified into ignition powder, launching powder, and solid propellant according to its use. Among them, the launching charge is divided into: gun launching charge, gun launching charge, ejector seat launching charge and so on. Solid propellant is also divided into solid propellant for rockets, solid propellant for missiles.

1. External characteristics

By the external characteristics of the gunpowder combustion can be divided into smoky and smokeless drugs: according to the gunpowder combustion of the surface area of the different changes can be divided into reduced surface combustion of gunpowder, constant surface combustion of gunpowder, increased surface combustion of gunpowder.

2. Molding process

The gunpowder molding process can be divided into: pressed gunpowder, casting gunpowder, mixed gunpowder. According to certain characteristics of gunpowder can be divided into volatile gunpowder, difficult to volatile gunpowder.

3. Structure

The most commonly used is the structure of gunpowder is divided into homogeneous gunpowder and heterogeneous gunpowder, because the structure is different, bring the nature of the process, the nature of the combustion and the physical and mechanical properties of the significant differences. Homogeneous gunpowder is also divided into: single-based drug, double-based drug, multi-base drug, modified double-based drug. Double-base drug is further divided into Kodak-type double-base drug, Balestra-type double-base drug. Heterogeneous gunpowder is further divided into black powder, composite gunpowder, etc.. The company has developed leading technologies in the international consumer credit industry and combined them with its own business data accumulated over the years to comprehensively assess customer risk based on credit records, customers' natural attributes, and third-party big data information.

Baidu Encyclopedia - Gunpowder