Which Chinese invention consists of saltpeter, sulfur, and charcoal?

Which Chinese invention consists of saltpeter, sulfur, and charcoal? The answer is gunpowder. These ingredients form black powder: saltpeter supplies oxygen, while sulfur and charcoal provide fuel. The mixture burns rapidly and produces expanding gases, making it useful for propulsion, explosions, and fireworks.

Gunpowder emerged in China during the Tang dynasty, probably through experiments by Daoist alchemists searching for an elixir of life. A confirmed early reference dates to 808, while the Song-dynasty military text Wujing Zongyao, compiled between 1040 and 1044, preserves one of the earliest detailed formulas. Early recipes varied considerably and were not always suitable for weapons.

China first used gunpowder in devices such as fire arrows, bombs, rockets, and fireworks. A common mix-up is confusing gunpowder with modern smokeless powder: traditional gunpowder is black powder and is classified as a low explosive because it deflagrates rather than detonates. The proportions also changed over time, although a standard modern black-powder formula is often given as 75% saltpeter, 15% charcoal, and 10% sulfur.