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Title: Magnetic forces to blame for 9/11 tower collapse
Source:
The Independent
URL Source: http://www.independent.co.uk/news/s ... 911-tower-collapse-924509.html
Published: Jul 24, 2009
Author: Steve Connor
Post Date: 2009-07-24 16:54:32 by Lysander_Spooner
Keywords: None
Views: 6464
Comments: 119
Magnetic forces to blame for 9/11 tower collapse By Steve Connor Wednesday, 10 September 2008 Scientists can finally explain why the Twin Towers collapsed on September 11, despite the temperature of the fires being well below the 1,500C melting point of the steel girders holding up the buildings. The discovery that unusual magnetic forces within the girders made them weak at temperatures of about 500C explains away the conspiracy theories that have spread like wildfire since the disaster. Sergei Dudarev, of the UK Atomic Energy Agency, found that steel loses its strength above 500C because its molecules undergo a physical transition from one state to another due to magnetic fluctuations. "The steel didn't melt, it just became soft. It is an unusual state and the temperatures in the Twin Towers were high enough to cause it because the thermal insulation was knocked off the girders through the impact with the aircraft," he said. "Understanding how materials behave means we can find the right 'medicine' to make steel stronger at high temperatures... and if our work can be used for other applications, such as safeguarding tall buildings against disasters, so much the better," he said.
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#5. To: Lysander_Spooner (#0)
It's not an unusual state. Any blacksmith can tell you that when heated at temperatures well below the level produced in the WTC fires, steel and iron weaken and become malleable. Some conspiracy nuts think that the only way steel can weaken is if it's heated to complete liquification; they were only demonstrating their own ignorance. And, by the way, some nut started the story of a pool of molten steel at Ground Zero, still liquid days after the collapse. Simply impossible. Even a nuclear explosion wouldn't have that effect. Nobody did a metallic analysis that showed this was steel or any other normal metal. What was seen was a greyish puddle of a variety of fluids, including water, paint, melted plastic, various industrial liquids, that had mixed together from the fire, collapse and fire fighting efforts at the WTC.
Credit for illustration: deesillustration.com
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#9. To: Shoonra (#5)
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