How is phosphorus formed?

Phosphorus exists widely in animals and plants, so it was originally obtained from human and animal urine and bones. This is different from the metal elements obtained from minerals in ancient times. It is the first element obtained from organisms. Inside the human body, besides the vast majority of carbon, hydrogen and oxygen, there are other elements, such as phosphorus, sulfur and iron. Human bones contain more calcium phosphide. People are dead, bodies are buried in the ground to rot, and various chemical reactions are taking place. Phosphorus is converted from phosphate to phosphine. Phosphine is a gaseous substance with low ignition point, which will burn when it comes into contact with air at room temperature. After phosphine is produced, it will emerge into the air along cracks or holes in the ground and burn to emit blue light. This is phosphorus fire, also known as "ghost fire".