Saltpeters is a chemical that is commonly used in fertilizer, gunpowder production, and food preservation, among other things. It is also known as potassium nitrate, and there are several synonyms for saltpeters, including nitrate of potash, niter, or Chile saltpeter. These synonyms describe the same chemical compound, which is made up of potassium, nitrogen, and oxygen. Although saltpeters are primarily used in industrial applications, they can also be used as a food preservative and can help to prevent the growth of bacteria and fungi in meats and cheeses. Whatever name you use, the compound is an essential component of many products we use every day.