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Originally Posted by willravel
The problem, at least in my mind, is that when you heat a stel sturcture the heat moves out, and thus dissapates, acros the entire structure. Imagine pouring applesauce onto a plate. The applesauce doesn't just stack up, it spreads across the flat surface. What surprises me is the fact that a fire in the North Tower, spread through 200,000 (est) tons of steel enough in 104 minutes to cause a structural collapse. In addition to this, a great deal of the fuel from each plane was instantly burned upon impact (thus the explosions in the pictures and video).
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I remember hearing an explanation for this that claimed that the ignited fuel poured down central shafts, burning and heating the core supports the whole way down to the ground. I don't know what that does to your requirement for all the fuel to stay in one place to have a hot enough fire, though.