What describes the interaction required for an initiator to work effectively?

The effectiveness of an initiator is closely linked to its sensitivity characteristics. An initiator, often used in explosives or pyrotechnics, must have the ability to respond to various stimuli such as heat, shock, and friction. This sensitivity allows it to achieve reliable detonation under specific conditions while maintaining safety when not being activated.

The primary function of an initiator is to start a chain reaction that leads to a larger explosion or reaction, which is why it must be highly sensitive to various triggers. This quality distinguishes it from more stable materials that might not react as desired under the same conditions.

In contrast, while the ability to withstand extreme pressure, remaining inactive until triggered, or requiring a chemical reaction can apply to certain materials or components, these are not defining characteristics of an initiator's operational effectiveness. An initiator’s role is fundamentally about quickly and reliably transitioning from a stable state to an active state when the appropriate conditions are met.