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Bang snaps
Bang snaps (also known as Throwdowns, snap-its, poppers, pop-its, snappers, whip'n pops, Pop Pop Snappers, whipper snappers, fun snaps, party snaps, or snap'n pops) are a type of small novelty firework sold as a trick noisemaker.〔Phantom Fireworks Co, "Fireworks University: Glossary". (Fireworks.com )〕
==Composition==
Bang snaps consist of a small amount of gravel or coarse sand impregnated with a minute quantity (~0.08 milligrams) of silver fulminate high explosive and twisted in a cigarette paper to produce a shape resembling a teardrop with a tail. When stepped on, ignited, or thrown on a hard surface, the friction-sensitive silver fulminate detonates, producing a sharp salute similar to that of a cap gun.
Despite producing a legitimate (albeit tiny) high-explosive detonation, the extremely high mass ratio of gravel to explosive acts as a buffer to ensure that the devices produce only the audible "crack" of the supersonic shockwave; they are incapable of producing physical damage, even if discharged directly against skin, and the detonation frequently fails to even break the thin paper holding the ingredients.〔Katz, David A. "Chemistry in the Toy Store". 6th ed, 2002. (Chymist.com )〕 The explosion is also too weak to propel the gravel any distance, which usually falls to the ground. This makes them safe for use as a children's toy, for which purpose they have been widely sold across the world since the 1950s. They are also a common part of Chinese New Year celebrations.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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