Working of Fireworks |
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Pyrotechnics is the science of using materials capable of undergoing self-contained and self-sustained exothermic chemical reactions for the production of heat, light, gas, smoke and/or sound.
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How a spherical shell works? |
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A shell consists of a spherical ball or cylinder and a lift charge.
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When ignited by the pyrotechnician, the lift charge on the bottom of the shell - a bag or cup full of black powder - explodes, shooting the shell into the air like a bullet from a gun.
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As the shell is rising upwards, a time fuse inside of it burns towards the burst charge.
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At the precise altitude, the burst charge - consisting of black powder impregnated on rice hulls - blasts it apart and ignites the color pellets (stars) on the inside.
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The internal time fuse goes out through the bottom of the shell and is ignited by the lifting charge as is the case with consumer shells.
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On large shells, however, the blast of the lifting charge could literally blow the fuse away without igniting it, so the time fuse is made to go out through the top of the shell.
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If this method is used, the time fuse is coated with a priming composition and is ignited by the hot gases of the lift charge.
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Watch this Video |
Working of other fireworks |
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