Gunpowder was developed in China during the 10th century CE. It consists of 75% potassium nitrate, 15% charcoal, and 10% sulfur. It is classified as a low explosive, burning at subsonic speeds
Potassium (K) is essential for plant growth and used in glass production. Sulfur (S) is essential for all living things and used in batteries. Oxygen (O) is most prevalent element on earth and used in rocket propulsion