Gunpowder or black powder is made from potassium nitrate and charcoal. The charcoal is considered as the fuel and the potassium is the oxidizing agent. When adding the sulfur to the previous components the gun powder becomes so strong and allow the burning materials to ignite easier with low temperature.
The Chinese were the first to discover the gun powder. At 140 AD in China an alchemist Wei Boyang noticed that when flaming the mixture of black powder it creates an explosion.
At the beginning the Chinese physicians used
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