"7a. How could the steel have melted if the fires in the WTC towers weren’t hot enough to do so?
OR
7b. Since the melting point of steel is about 2,700 degrees Fahrenheit, the temperature of jet fuel fires does not exceed 1,800 degrees Fahrenheit and Underwriters Laboratories (UL) certified the steel in the WTC towers to 2,000 degrees Fahrenheit for six hours, how could fires have impacted the steel enough to bring down the WTC towers?
In no instance did NIST report that steel in the WTC towers melted due to the fires. The melting point of steel is about 1,500 degrees Celsius (2,800 degrees Fahrenheit). Normal building fires and hydrocarbon (e.g., jet fuel) fires generate temperatures up to about 1,100 degrees Celsius (2,000 degrees Fahrenheit). NIST reported maximum upper layer air temperatures of about 1,000 degrees Celsius (1,800 degrees Fahrenheit) in the WTC towers (for example, see NCSTAR 1, Figure 6-36).
However, when bare steel reaches temperatures of 1,000 degrees Celsius, it softens and its strength reduces to roughly 10 percent of its room temperature value. Steel that is unprotected (e.g., if the fireproofing is dislodged) can reach the air temperature within the time period that the fires burned within the towers. Thus, yielding and buckling of the steel members (floor trusses, beams, and both core and exterior columns) with missing fireproofing were expected under the fire intensity and duration determined by NIST for the WTC towers.
UL did not certify any steel as suggested. In fact, in U.S. practice, steel is not certified at all; rather structural assemblies are tested for their fire resistance rating in accordance with a standard procedure such as ASTM E 119 (see NCSTAR 1-6B). That the steel was “certified ... to 2000 degrees Fahrenheit for six hours” is simply not true.
"
Jet fuel burns at 800º to 1500ºF, not hot enough to melt steel (2750ºF). However, experts agree that for the towers to collapse, their steel frames didn't need to melt, they just had to lose some of their structural strength--and that required exposure to much less heat. "I have never seen melted steel in a building fire," says retired New York deputy fire chief Vincent Dunn, author of The Collapse Of Burning Buildings: A Guide To Fireground Safety. "But I've seen a lot of twisted, warped, bent and sagging steel. What happens is that the steel tries to expand at both ends, but when it can no longer expand, it sags and the surrounding concrete cracks."
Originally posted by zeeblebotWhat does the report say about the collapse of WTC7 and the lack of fusilage at the Pentagon?
"7a. How could the steel have melted if the fires in the WTC towers weren’t hot enough to do so?
OR
7b. Since the melting point of steel is about 2,700 degrees Fahrenheit, the temperature of jet fuel fires does not exceed 1,800 degrees Fahrenheit and Underwriters Laboratories (UL) certified the steel in the WTC towers to 2,000 degrees Fahrenheit f ...[text shortened]... he steel was “certified ... to 2000 degrees Fahrenheit for six hours” is simply not true.
"
D
Originally posted by XanthosNZWhile I'm not fond of conspiracy theories, I can see what your "serious" sources of information are. Can I laugh at them?
http://www.pointlesswasteoftime.com/911truth.html
EDIT: Also
http://www.ccdominoes.com/lc/LooseChangeGuide.html
http://www.911myths.com/index.html
http://www.debunking911.com/
These are all addressed at that ridiculous mockumentry Loose Change which arrakis is so fond of.
Interestingly, this debate was interrupted on 9/11..
After going through many material over the issue, I think it's a big conspiracy and it will come out sooner or later. You can't fool everyone all the time. THere are so many indications.. just remember Silverstein's mega deal with pulling the building down nearby. Outrageous laugh into intelligent people's face.
But since the conspiracy had so many people involved that did earn a lot of money, you can (or can't) imagine how the world is ruled today.
I have a few links for interested public.. just ask.