Among the three primary effects, which is least destructive?

• A. Fragmentation Effect
• B. Thermal Effect
• C. Blast Pressure Effect
• D. Primary Blast Injuries

Answer: (B)

Three primary blast effects are the blast overpressure (pressure wave), fragmentation from debris, and thermal radiation. The pressure wave can cause catastrophic internal injuries and structural damage; fragmentation injures through penetrating projectiles hurled by the explosion; thermal radiation delivers heat that can ignite materials and burn exposed skin. The thermal effect is the least destructive overall because, while burns can be severe, the heat exposure typically causes fewer immediate life-threatening injuries and less widespread structural harm than the crushing force of the overpressure or the widespread penetrating trauma from fragments. Protective strategies focus first on mitigating overpressure and fragmentation, with burns addressed through distance, protective clothing, and fire suppression. Note that primary blast injuries are injuries caused by the pressure wave itself, not a separate effect category.