gunpowder
The gunpowder, also known as the black powder, was an early explosive until the middle of the seventeenth century was the only chemical explosive. Gunpowder is usually made of sulfur, charcoal and saltpeter (potassium nitrate) mixed with sulfur and charcoal as a fuel, and saltpeter is used as an oxidant. Due to the burning characteristics of gunpowder and can produce a lot of gas and heat, gunpowder is widely used as fireworks in firearms and fireworks. Academics generally believe that gunpowder invented in the 7th century China, is the Chinese warlock for the refining of raw drugs and by-products. As early as the Tang Dynasty, "too on the holy savages of the savage", there is a written record of early gunpowder formula. The discovery of gunpowder led to the discovery of fireworks and early gunpowder weapons in China. Then gunpowder weapons also appeared in Arabia, Europe and India. It is generally believed that the European gunpowder technology is spread by the Arabs. The earliest written record of gunpowder in the West was recorded by the British philosopher Roger Bacon in the 13th century. ...