Which term matches the definition: occurs when something burns rapidly with intense heat by combustion?

• A. Cartridge
• B. Ammunition
• C. Deflagration
• D. Gun Powder

Answer: (C)

Rapid combustion propagation describes how a material burns quickly and produces intense heat, with the flame spreading through the substance. This is deflagration. It occurs at subsonic speeds and moves mainly by heat transfer, not by a shock wave. Among the options, deflagration is the process name that matches this description. The other terms refer to things rather than the burning process—cartridge and ammunition are types of rounds, and gun powder is the propellant that can burn, but it isn’t the process itself.