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Germ22 ago

Jet fuel Open Air Burn temperature: 1,030 °C (1,890 °F)
Iron, out of the ground, melts at around 1510 degrees C (2750°F). Steel often melts at around 1370 degrees C (2500°F).
So jet fuel wont melt the steel. but you do not need to melt steel for it to loose it's strength. Steel heated to a few hundred degrees significantly weakens the steel and makes it more pliable.

pby1000 ago

The impact of the plane could have weakened the beams. However, the fall of the buildings looked very controlled. That is suspicious to me.

Samsquamch ago

Your second point is the only part I question as well - I don't see why truthers think the beams had to be turned into molten steel (melting point) before the weight they could support decreased.

But yeah, I would expect the top part of the building to fall in a different motion compared to the area below where the plane struck that still had full support.