Explosives are substances which, wh·~n de~onated, are'very rapidly converted into large volumes of gases. When the explosion is confined by some form of bomb or shell casing, the pressure ruptures the casing impaiting high velocity to the resulting fragments. The remainder of ,the energy then produces the blast shock wave, fire and ground shock. There are three components of the compound blast wave in air: positive phase, negative phase and the mass movement of air.
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