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Originally Posted by f5fstop
I should also mention, the expert I saw a TV answered the question on temps of burning jet fuel, max of around 800 degrees, versus temp to melt steel, around 1600 degrees.
The towers had numerous tunnels underneath. The fires drew in colder air from the bottom tunnels, thus causing a bellows affect, creating temps higher than 800 degrees.
In addition, he made mention that it does not take long for metal to become brittle at temps above 400 degrees, and at around 800 the process is faster. So when the floors that were hit burned for a while, the metal became brittle, collapsing the floors above and that massive weight, started the domino affect.
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The metal doesn't have to melt. And metal becomes brittle by cooling and heating cycles. BUT, heat structural metal to 800 degrees and it begins to deform under load. It doesn't have to flow to create a problem, just deform.
The whole sticking a pot on a kitchen burner was the icing on the cake. Some neophyte trying to explain that all metals are somehow the same. Let's put it this way. All structural steel in buildings is coated with some type of fire retardant. Asbestos was likely used on the Towers. This is because should there be a normal building fire the structural metal needs to remain below certain critical temps so that they keep their form while under load. Much of the load bearing steel structure was eliminated in sections on the Towers and then you added an intense fire that weakend what was left. It's all really simple.
I could go on and on and on and on and on and on and on and on, on just the first 18 minutes of that production. I don't even think Michael Moore would claim anything like that.