Cách sử dụng
Saltpetre, also spelled saltpeter, is a white powder that is composed of potassium nitrate. It is commonly used in the production of fertilizer, fireworks, and as a food preservative. In the past, it was also used as a component of gunpowder. Nowadays, it is not often used in everyday conversation, but may be encountered in historical texts or discussions about chemistry or explosives.