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Originally Posted by chshkt
The melting point of structural steel is 2,750 degrees Fahrenheit and the temperature of jet fuel does not exceed 1,800 degrees. Molten metal was also found in the building known as WTC7, although no plane had struck it.
Not only that but also free fall.
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Well - Im sure some civil engineers will disagree with this - but - NIST(the US government testing labs) did some studies and tests on the stuctural steel from the towers and found that they had only been exposed to a temperature that would be expected from a jet fuel fire of that type - which generally burns at less than 500 deg F - the fuel fire lasted approximately 10 minutes before it was all used up based on the colors of smoke from the building - then the furniture and office supplies as well as wall board took over and would have burned at the temperature of a normal house fire - again - way lower than the temperatures need to deform steel
More importantly is that the firefighters were able to reach the stairway door outside the primary impact floor (they were all killed just as they were going in to put out the remaining fire due to the collapse) - which if a fire inside the door was burning anywhere near the melting point of steel - would have vaporized the firefighters and their hoses - which just didnt happen. The construction of those doors was not steel and no firefighter in his right mind makes the decision to enter a room that is burning above 500 degrees - let alone 1500 degrees - and they would have radioed that to the command center if they encountered those temps - but they didnt - they radioed they were entering the floor to fight the leftover fires