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A fire in one part of a building can heat up some metal object that runs through a wall from the area of the fire to another location, as yet not affected by the fire.

The fire in the first location makes the metal red hot and as metal is a good conductor, the heat travels along it, through the wall into the new area. If the metal in the new area is on contact with some combustible material this can then be set alight and the fire spreads.

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Related Questions

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