What commonly initiates explosive decomposition in reactive materials?

• A. the addition of water
• B. heat or other form of energy input
• C. pressure
• D. the addition of a reactive material

Answer: (B)

Initiation of explosive decomposition happens when enough energy is supplied to overcome the material’s activation barrier, triggering rapid, self-propagating breakdown. The most common initiator across reactive materials is heat or another form of energy input—such as a flame, hot surface, electric spark, friction, or shock—that raises temperature to the point where decomposition becomes autocatalytic and runaway. Once started, the reaction releases heat faster than it can be removed, producing an explosion. Water isn’t a universal initiator; it can interact with some materials in hazards other than initiating explosive decomposition. Pressure by itself can worsen outcomes through confinement but doesn’t typically start the decomposition. Adding another reactive material might create a hazardous mix, but initiation is usually driven by an energy input rather than merely mixing.