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A squib is a miniature explosive device used in a wide range of industries, from special effects to military applications. It resembles a tiny stick of dynamite, both in appearance and construction, although with considerably less explosive power. Squibs consist of two electrical leads which are separated by a plug of insulating material, a small bridge wire or electrical resistance heater, and a bead of heat-sensitive chemical composition in which the bridge wire is embedded. Squibs can be used for generating mechanical force, or to provide pyrotechnic effects for both film and live theatrics. Squibs can be used for shattering or propelling a variety of materials.〔(【引用サイトリンク】work=Fantasy Creations FX )〕 A squib generally consists of a small tube filled with an explosive substance, with a detonator running through the length of its core, similar to a stick of dynamite. Also similar to dynamite, the detonator can be a slow-burning fuse, or as is more common today, a wire connected to a remote electronic trigger.〔 “Reusable non-pyrotechnic countermeasure dispenser cartridge for aircraft.”〕 Squibs range in size, anywhere from 2 to 15 millimeters in diameter.〔 In the North American film industry, the term squib is often used to refer variously to: electric matches and detonators (used as initiators to trigger larger pyrotechnics). Squibs are generally (but not always) the main explosive element in an effect, and as such are regularly used as “bullet hits”.〔 Conventional squibs fire once, with the exception of eSquibs™, which fire 200 or more times before depletion. 〔http://livedesignonline.com/news/ldi-2014-award-winners-announced〕 ==Uses== Squibs were once used in coal mining to break coal away from rock. In the 1870s, some versions of the device were patented and mass-produced as "Miners' Safety Squibs". Today, squibs are widely used in the motion picture special effects industry to simulate bullet impacts on inanimate objects. Items such as sand, soil or wood splinters may be attached to the squib to simulate the "splash" that occurs when bullets pierce different materials.〔 Although squibs were once used even for the simulation of bullet hits on live actors, such use has been largely phased out in favor of more advanced devices that are safer for the actor, such as miniature compressed gas packs. These alternate devices are often still referred to as "squibs" even though they do not use explosive substances. The devices (whether explosive or not) are coupled with small balloons filled with fake blood and often other materials to simulate shattered bone and tissue. Squibs are used in emergency mechanisms where gas pressure needs to be generated quickly in confined spaces, while not harming any surrounding persons or mechanical parts. In this form, squibs may be called gas generators. One such mechanism is the inflation of automobile air bags. In military aircraft, squibs are used to deploy countermeasures, and are also implemented during ejection to propel the canopy and ejection seat away from a crippled aircraft. They are also used to deploy parachutes.〔 Squibs are also used in automatic fire extinguishers, to pierce seals that retain liquids such as halon, fluorocarbon, or liquid nitrogen. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Squib (explosive)」の詳細全文を読む スポンサード リンク
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