Comments by "Gaza is not Amalek" (@Ass_of_Amalek) on "How The Irish Got So Good At Smoking British Soldiers" video.
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@tiagobelo4965 that's the difference between a primary explosive (high or low) and a secondary (high) explosive. the low/high distinction refers to deflagration vs detonation. in the former, the ignition spreads much slower throughout the explosive by heat, and in the latter, it spreads much faster, with the ignition being caused by the pressure. the more instantaneously the whole mass is turned into gas, the sharper the pressure increase turns out, increasing destruction. the highest velocities are needed for armour penetration through shaped charges.
low explosives like black powder and other gunpowders always burn very quickly, and to explode, they require pressure containment. as long as the initial detonation is provided, high explosives tend to require no pressure containment. some of those burn slowly or not at all. both blasting caps and impact primers use primary high explosives that are easily detonated by relatively little friction and easily ignited by heat, with the ignition turning from deflagration into detonation if pressure is contained.
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