Which will create more damage in an explosion: the Upper or Lower Explosive Limit?

Which will create more damage in an explosion: the Upper or Lower Explosive Limit?

• A. Upper Explosive Limit
• B. Lower Explosive Limit
• C. Upper Ignition Threshold
• D. Lower Ignition Threshold

Answer: (A)

Explosive limits bound the flammable fuel–air mixture. Below the lower limit there isn’t enough fuel to sustain combustion; above the upper limit there isn’t enough oxygen for the fuel to burn. Within that usable range, a richer mixture (closer to the upper limit) generally releases more energy and creates higher peak pressures than a lean mixture near the lower limit, given the same confinement. That means the upper explosive limit corresponds to the conditions that tend to produce more damage. The other options refer to ignition thresholds, which describe the energy or conditions needed to initiate combustion, not the potential damage from the explosion.

Explosive limits bound the flammable fuel–air mixture. Below the lower limit there isn’t enough fuel to sustain combustion; above the upper limit there isn’t enough oxygen for the fuel to burn. Within that usable range, a richer mixture (closer to the upper limit) generally releases more energy and creates higher peak pressures than a lean mixture near the lower limit, given the same confinement. That means the upper explosive limit corresponds to the conditions that tend to produce more damage. The other options refer to ignition thresholds, which describe the energy or conditions needed to initiate combustion, not the potential damage from the explosion.