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Originally Posted by willravel
So friction, not fire, is what caused the great heat? What about the several pictures taken of yellow-to-white hot metal falling from the not yet fallen towers?
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Well kind of, the fire was a great source of heat, and the majority of the cause of the collapse, but the cause of the incredible heat in the rubble was the fire, and the collapse.
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Originally Posted by willravel
Yellow fire = moten steel; around 1000 degrees C. If aluminum from the plane or exterior had melted, it would melt and flow away from the heat source at its melting point of about 650 degrees C and therefore would not reach the yellow color observed for this molten metal. However, the iron found in steel could reach the yellow-to-white hot temperatures. Again, I'm not going to try and explain it yet, BUT I will say that I have no reasonable (in following with the official story) explaination for this.
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Well first off, we don’t know if this is steel, copper, aluminum, it could be anything, and there are no reports of molten steel being found. I am unsure why you think the molten aluminum flows away from heat; it would pool and flow downhill, which ever way that is. But as for them being ‘cutter charges’ that just is ludicrous, if it were a shaped charge, the effect would be nearly instantaneous, and not leave a long trail, if it was thermite, thermite can only be used to cut down, and cutting a horizontal support on the edge of the building would be pointless, not damaging the structure in any real degree, and visible to everyone, the only important horizontal points are the trusses, but they are inside and would no be visible like this is. Further more, the fire was plenty to take the building down. it could be an exotic metal igniting, such as aluminum, magnesium, or the like.
Another great article on the collapse:
http://www.pbs.org/wgbh/nova/wtc/collapse.html
As for MrSelfDestruct, sorry your post got buried;
As for your paper, it’s good and concise, I agree with it. Thanks for the input.