Compared to high explosives, what characteristic is lacking in a low-order explosive?

• A. Subsonic vacuum pressure.
• B. Ability to inflict injury.
• C. Ability to cause death.
• D. Over-pressurization shock wave.

Answer: (D)

The key idea is the difference in how these explosives release energy. High explosives detonate, creating a supersonic shock front that generates a sudden, powerful over-pressurization—the main driver of blast damage. A low-order explosive, on the other hand, burns or deflagrates more slowly and does not produce that intense shock wave. So, while a low-order explosive can still harm people or cause fires through heat and fragmentation, it lacks the over-pressurization shock wave that characterizes high-explosive blasts. That’s why the distinctive missing feature is the over-pressurization shock wave.