Which low explosive is made from a mixture of potassium or sodium nitrate, charcoal, and sulfur?

The correct answer is Black Powder, which is indeed a low explosive originating from a mixture of potassium or sodium nitrate, charcoal, and sulfur. This combination creates a highly combustible substance that produces a large volume of gas and heat when ignited, making it effective for both pyrotechnic purposes and historical uses in firearms and explosives.

Black Powder is specifically known for its role in fireworks, providing the necessary lift and explosive force to enable the display of aerial shells. Understanding the components of Black Powder clarifies its importance in conceptualizing the chemistry and functionality behind fireworks; the nitrate serves as an oxidizer, while charcoal acts as a fuel, and sulfur helps to lower the ignition temperature and enhance the overall combustion process.

The other options refer to different substances or products used in pyrotechnics but do not match the specific mixture of ingredients identified in the question. Therefore, recognizing the composition and characteristics of Black Powder is crucial for understanding its application in fireworks displays and complying with safety regulations outlined in NFPA 1123.