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D3V

Quote:

The contention is not that the fire melted the structural steel. Only that the heat made the steel weaker and more malleable at the higher temperatures. Steel becomes weaker as its temperature increases. The fire is not isothermal, some parts would have reached higher temperatures than others.

The author mentions the amount of structural steel in the buildings as if implying that the planes would need to melt all or a significant proportion of it to collapse. All that was required was that the steel supports were sufficiently weakened in a few small, but critical, areas and then the building would come down.

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