Which one of the following is an example of low explosive?

Gunpowder

Gelatine

TNT

Dynamite

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UPSC CISF-AC-EXE – 2021

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Low explosives are substances that deflagrate (burn rapidly) rather than detonate (explode via a supersonic shockwave). Gunpowder (including black powder and smokeless powder) is a classic example of a low explosive. The burning speed creates a rapid expansion of gases, suitable for propellants (like in firearms or fireworks) but not for shattering effects required in demolition. Gelatine, TNT (Trinitrotoluene), and Dynamite are all high explosives used for their destructive detonating power.

Low explosives deflagrate, while high explosives detonate.

The primary difference lies in the speed of decomposition and the resulting pressure wave. High explosives decompose much faster, creating a shockwave that propagates at supersonic speeds, causing detonation. Low explosives burn comparatively slowly at subsonic speeds, causing deflagration.

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