why do petrol road tankers usually have a length of metal chain hanging down to touch the ground
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The static electricity is created due to the friction of the surfaces of the petrol road tankers and the larger accumulation of the static charges may cause explosion.
Hence, a certain length of metal chain hangs down to the earth for transferring this accumulated static electricity to the ground continuously and thus helps in averting such accident.
Hence, a certain length of metal chain hangs down to the earth for transferring this accumulated static electricity to the ground continuously and thus helps in averting such accident.
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