I didn't say that the top floor would/did evaporate. That wouldn't make much sense. Floors 1-80? Probably crushed into a fine powder.
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This is, at the very least, counterintuitive.
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Not really. The fire is on the inside and heat travels up. So people near the holes could be fine while the fires behind them blaze up into the floors above them. I'm sure they wouldn't have been hanging out of that hole if it was pleasant inside.
I don't see how it would be very little heat when it was jet fuel burning. That alone suggests that it was rather hot. If the metal supporting the inside weakened enough it would begin to collapse inward and down, pulling the roof down since all that is connected in there. Once the one floor goes and falls onto the weakened floor below that one will go, then you have 2 stories worth of weight compacting on a 3rd weakened floor etc.. At some point soon after that the floors don't need to be weakened due to all the extreme weight.
Take the weight of 1 floor (tons of steel and such).. falls.. now double it by adding a second floor (thats a lot of weight). Now another floor.. and another.. That weight builds up mighty quickly and its all bearing down on the next floor.. and the next.. and so on. Anything in and around those floors is going to get obliterated.