How is 'explosive' defined according to Army regulations?

The definition of 'explosive' according to Army regulations focuses on the characteristics of materials that can undergo rapid chemical reactions resulting in the production of gas and heat. When an explosive substance detonates, it releases a significant amount of energy in a short time, leading to a rapid expansion of gas. This rapid reaction is what distinguishes explosives from other chemical substances. The generation of gas and heat is critical, as they are indicative of the energy release that can result in a hazardous situation.

In the context of explosive safety, understanding this definition is fundamental to recognizing the potential dangers associated with such materials. The ability to produce gas and heat quickly is what makes explosives capable of causing destruction, which is why regulations are in place to ensure proper handling, storage, and transportation.