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Originally posted by doctorfungi
The amount of thermite needed to produce a reaction like that would require a HUGE amount of thermite.
Originally posted by Slap Nuts
Why the "thermite" mass requirement calculations are WRONG.
The NIST recently addressed the usage of "thermite" in the twin towers and wrote:
Therefore, while a thermite reaction can cut through large steel columns, many thousands of pounds of thermite would need to have been placed inconspicuously ahead of time, remotely ignited, and somehow held in direct contact with the surface of hundreds of massive structural components to weaken the building. This makes it an unlikely substance for achieving a controlled demolition.
This is VERY misleading ON PURPOSE and they know it. Here is why...
1.SO... #1 they would not have just used Iron thermite.
iron-thermite is typically not used alone as an incendiary mixture. It is used in multi-component thermite-incendiary compositions, in which another oxidizer and binder are included, together with thermite. Thermate-TH3, a mixture of thermite and pyrotechnic additives, was found to be superior to thermites and was adapted for use in incendiary hand grenades. Its composition by weight is generally thermite 68.7%, barium nitrate 29.0%, sulfur 2.0% and binder 0.3%. Addition of barium nitrate to thermite increases its thermal effect, creates flame in burning and reduces the ignition temperature.
2. ThermAte burns minimally 2x-10x as hot and fast as thermIte (depends on formula)... Reduce their calculations by 1/2 minimally or 1/10th.
3. NANO-thermAte... typical aluminum particles have only 1/10th of 1% of their atoms exposed on the surface. Whereas, nano-particulates, have almost 50% of their surface exposed as atoms, increasing reaction rates by 1,000x.
So... you tell me... MINIMALLY Nano-thermate has reaction rates 1000x faster and 2x hotter than "thermite"... do you really need that much?
Then, we take our nano-thermate and put it in some aero-gel which allows us to shape it however we like to make perfect shaped charge cuts... This addresses the "inconspicuous and direct contact" arguments.
So, NIST... How many AERO-GEL, NANO-THERMATE SHAPED CHARGES would it take?
How would someone hide a huge lump of thermite on the roof without anyone noticing?
Logic people... please.
Studies have shown that the thermite reaction of nm-Al+MoO3 has a large theoretical energy density , increased ignition sensitivity , and near detonation flame propagation speeds  in comparison to traditional micron-particle thermites. This work will present macroscopic combustion behaviors (such as flame speed) along with experimental results focusing on the molecular reactions and thermal properties of nanocomposite Al+MoO3 thermite materials
Originally posted by bsbray11
So to hold that either it was no explosives or else TONS of them seems a little counter-intuitive, as if someone is more trying to discredit an idea than seriously consider it for a moment.
Originally posted by PisTonZOR
The part holding up the towers where in the centre of the structure. Thermite on the outside is pointless.