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If that fire was hot enough to melt the steel core in only a few hours, how was it not hot enough to show any effect on the aluminum, which has a much, much lower melting point?
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You dont have to melt the steel. What is required is the steel must lose structural integrity.
Here's some more math for you:
791-820 Tons of Steel per floor we agreed upon correct? So we'll cut the difference in half for 809 tons of steel alone per floor. Lets go ahead and run with that (ignoring people, equipment, wiring, or the hundreds of tons of concrete) since that's a hard number with little estimation.
It impacted between the 93rd and 100th floor correct? Lets cut it in half and go 96th story.
(117-96)*809 = 16,989 tons of steel structures above the impact. Once again this is ignoring ALL other weight, which could easily triple the number.
So that's 17 tons of direct downward pressure on a structure that is undoubtably damaged by a direct impact of say... 400 miles per hour by a plane that weighs several tons and carrying lots of fuel... which ignited.
The heat from the fires would suck in massive amounts of oxygen from the holes punched through both sides of the building. With fresh air being sucked in, the heat would be insulated from rising by the concrete slabs that the floors consisted of. Thus the steel heats to enormous temeratures which, as we know, causes steel to expand and lose it's rigidness.
The problem with the conspiracy theorists is they use the temperature for the melting of steel. While men have been making steel since ancient times, we can see steel doesnt need to melt to become fragile. That fragile nature of heated steel could not support the massive weight above and it collapsed.