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Here's another reason the 9/11 fire-mediated collapse theory has to be wrong.

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The notion that the WTC towers collapsed because fire weakened the steel is laughable.

The fact that other steel-framed, steel-cored buildings have suffered much longer burning, much larger in extent and, demonstrably, hotter
fires, and yet never collapsed, shows how difficult it is in practice to bring down one of these buildings from fire.

Apparently, these buildings are robust structures, highly over-built to handle heavy wind loads; and it seems you would need to heat a large volume of steel, uniformly, over a wide cross-sectional area of the structure, to even have a chance of making one collapse in the neat, symmetrical manner witnessed (to the extent it is even, theoretically, possible to do this without resorting to explosives in the first place).

The easiest way to see that these buildings were rigged for demolition is to start by considering the fact that, between the time Flt. 175 hit WTC2 and the time the building collapsed, only 56 minutes had elapsed.  And 56 minutes, simply, isn't enough time to develop a fire hot enough, nor large enough in extent, to even have a remote chance of getting enough steel hot enough to be a factor.

The best way to see the absurdity of the fire-mediated collapse theory is to make some simplifying assumptions...and apply some simple math and physics to the problem.

Say, for the sake of argument, that you’re concerned with one floor of the building. Assuming that you have an unlimited supply of readily combustible fuel available (which is, obviously, not true, but let's be generous), and there is no heat loss by convection, conduction or radiation (another ridiculous assumption, but let's give the shills every advantage).

Now, the rate at which the temperature rises on that floor will be determined by the composite thermal mass of the building materials associated with that floor, and the rate at which you can bring in oxygen to burn the fuel.  Assuming, say, about 5E5 kg of steel, and about 1.4E6 kg of concrete, per floor (taking internet based numbers at face value), with specific heats of about 450 and 3300 J/kg*C, respectively, simple algebra shows that you would have to release about 3.27E12 Joules of energy to uniformly bring the temperature from ambient up to, say, 700 degrees C (starting to get into the interesting range, but probably still not high enough to cause a collapse).

The problem is that for WTC2, you have to release this huge amount of energy in only 56 minutes.  That means you would have to burn somewhere on the order of 30,000 gallons of jet fuel in 56 minutes.  That means you would have to supply air to the fire inside the building at a rate somewhere in the neighborhood of 6E5 cubic feet per minute.

That's right, in order to bring the temperature of one floor of a WTC tower from 25 to 700 degrees centigrade, uniformly, in a short 56-minute time frame, you would have to supply about 600,000 cubic feet of air per minute...for each of those 56 minutes.  And that’s a ridiculously high number. And even if you did find a way to create such blast furnace like conditions, the fact of the matter is that you would convect a significant portion of the heat away, just like what happens in a fireplace; in order to let fresh air in, you have to let the heated, oxygen-depleted air escape.

If you were lucky, and the process was, say, 50% efficient (meaning the airflow only carried away half your heat), you would need to double everything, which would mean burning 60,000 gallons of jet fuel in 56 minutes, while feeding the fire with over one million cubic feet of air per minute.

By way of the above numbers, the absurdity of the "official" version of events is laid bare for all to see. 

 

Ex Government Worker
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What never seems to be addressed by the advocates ... by Paul Lefrak on Tuesday, Apr 28, 2009 at 10:03:25 AM
While the official government account of the event... by Rasoul Acheh on Wednesday, May 23, 2007 at 11:02:45 AM
fromfrom http://911research.wtc7.net/HEY TOLD US: ... by richard on Wednesday, May 23, 2007 at 11:56:30 AM
I meant to add, so adjust your quantity of availab... by richard on Wednesday, May 23, 2007 at 11:59:56 AM
I don't care if the whole building was filled ... by jpsmith123 on Wednesday, May 23, 2007 at 5:16:42 PM
the temperatures of hydrocarbon-based fires. I was... by richard on Wednesday, May 23, 2007 at 7:28:01 PM
carried by one of the WTC jetliners, just for purp... by Richard Mynick on Wednesday, May 23, 2007 at 12:07:01 PM
The official version of most things the government... by Roger on Wednesday, May 23, 2007 at 1:20:10 PM
Misleading HOGWASH It's a mistake opednews publ... by Ann Jones on Wednesday, May 23, 2007 at 2:29:33 PM
The wind-load design goal of the towers was somewh... by jpsmith123 on Wednesday, May 23, 2007 at 4:59:26 PM
Misleading HOGWASH It's a mistake opednews publ... by Ann Jones on Wednesday, May 23, 2007 at 2:30:18 PM
Anna/Mark Roberts lie: She/He said:"The ... by richard on Thursday, May 24, 2007 at 6:54:54 AM
Bro, I am not a lying shill, and this isnt about s... by Ann Jones on Thursday, May 24, 2007 at 10:12:34 AM
Why deliberately make your posts hard to read? Tha... by jpsmith123 on Thursday, May 24, 2007 at 4:41:18 PM
Evidence and reason, not lies and kneejerk BeliefB... by Ann Jones on Thursday, May 24, 2007 at 11:49:19 PM
If you had read my article, the article you w... by jpsmith123 on Friday, May 25, 2007 at 6:10:47 AM
Yes, she/he should be specific.  The building... by BreezyinVA on Friday, May 25, 2007 at 10:07:38 PM
Seems you are the one demonizing.  Not a good... by BreezyinVA on Friday, May 25, 2007 at 9:52:55 PM
???... by Blue Pilgrim on Wednesday, May 23, 2007 at 3:33:29 PM
Misleading Hogwash Indeed!  ... by Rasoul Acheh on Wednesday, May 23, 2007 at 4:02:28 PM
I suggest you should read what scientists, militar... by Christie on Wednesday, May 23, 2007 at 4:23:36 PM
exactly the same fallacious arguments that Mark Ro... by richard on Wednesday, May 23, 2007 at 7:32:20 PM
It seems I may be one of the first people to ... by jpsmith123 on Wednesday, May 23, 2007 at 9:19:17 PM
Folks, I am not a Bushiebot shill, etc. (actually ... by Ann Jones on Thursday, May 24, 2007 at 9:38:31 AM
Sorry, but if you want anyone to read your posts, ... by jpsmith123 on Thursday, May 24, 2007 at 3:18:24 PM
Ditz,  if it's THAT easy to bring buildin... by Tony Forest on Thursday, May 24, 2007 at 1:51:35 PM
   Within the first month after 9/11, I ... by rhalfhill on Thursday, May 24, 2007 at 8:58:54 PM
I respect your cynical skepticism, but you ignore ... by Ann Jones on Thursday, May 24, 2007 at 11:45:25 PM
Get a grip, folks, they collapsed!Folks, I am not ... by Ann Jones on Thursday, May 24, 2007 at 11:31:38 PM
The essential issues of 9/11 are quite simple. The... by Rasoul Acheh on Friday, May 25, 2007 at 10:19:10 AM
ditz99, you wrote:  "Smith uses specious... by James on Saturday, May 26, 2007 at 4:57:58 AM
The towers, by video evidence and testimony of the... by Ann Jones on Monday, May 28, 2007 at 7:25:11 PM
Sorry if you have no appreciation or understanding... by jpsmith123 on Monday, May 28, 2007 at 7:55:48 PM
Supporters of the official 9/11 fable, speak of co... by Rasoul Acheh on Tuesday, May 29, 2007 at 11:22:37 AM
Acheh, you may be correct, because i doubt we are ... by Ann Jones on Tuesday, May 29, 2007 at 11:10:05 PM
One of the most notable features of the human mind... by Rasoul Acheh on Wednesday, May 30, 2007 at 9:23:02 AM
It is really embarassing that the nation that put ... by psikeyhackr on Monday, Jun 18, 2007 at 10:44:22 PM