You can quantify both the gravitational and chemical
Energy released in the collapses?
I didn't know you'd require to consider the 15 seconds of collapse only. The question is: Where did the iron-rich microspheres in the post-collapse dust come from? Several alternatives are proposed:
1. Thermitic demolition charges planted by the evil government - that's what truthers think
2. Office fires and the heat they generated - that is what RJ Lee, who quantified these spheres, thinks; and so do I
3. They were already in the buildings before 9/11 (fly ash, dust from cutting and welding) - that's what you think
4. Sparks, friction and collisions of steel members during the collapse - that's what you and LSSBB currently wonder
5. Clean-up work after the collapse
And probably more possibilities exist. Two of the least likely, that nonetheless demonstrate that it doesnt't take extremely hot chemical reactions are
6. Star dust
7. Burning steel wool
When Chris Mohr asked a metallurgist, that man said that he had never observed such spheres in the debris from
office fires. Chris does not mention collapses. So I spoke only of spheres from fires.
I didn't believe that was possible, even Dr. Greening
and Dr.Benson did not do that.
There are variables that make the exact
Energy produced in the collapses impossible
Oh the source of energy are rather easily quantified - I just did, didn't I? Again, no need to restrict consideration to the 15 seconds of collapse - spheres could have been created, during collapse as well as before and even after.
What Greening struggled to quantify was the energy sinks: How much of the potential (gravitational) energy went into cold-crushing concrete, how much into cold-bending and breaking steel, how much into seismic waves, how much into heat? Especially the energy expended to break concrete is very sensitive to assumptions: It scales with the area of break surfaces, and that scales with the inverted square of average particle size. What Greening lacked reliable and sufficiently exact data on was particle size distribution.
To quantify other than gravitational potential
Which does not take into account reactions
Induced by the collapses themselves.
Chris and I were clearly talking about office fires. I quantified the avaible chemical energy for those. 35 tons of combustible office contens per floor (order of magnitude). You won't add significantly to that if you are going to speculate about steel surfaces and paint reacting - total paint mass on the steel was 75 tons (order of magnitude), but surely only a very small fraction of that, if any, reacted the way you think, and only 10% or so of that paint was iron from iron oxide - we are talking about much less than a ton - a tiny fraction of total dust.
Without experimental data on possible.energy
Values induced by the collapses any.attempt to
Quantify them is pointless. Past collapse initiation.
I disagree - orders of magnitude and upper and lower limits can be estimated.
For example: To create a "spark" from a collision of a piece of steel, you need to heat the spark (a small mass of iron or iron oxide) to a certain temperature at which it glows. The heat would come from kinetic energy, which in turn came originally from potential energy.
On average, steel fell from a height of 200 meters, so it had a potential energy of (m*g*h)/m = g*h = 9.8*200 J/kg = 2000 J/kg = 2 J/g.
Iron has a heat capacity of 25.1 J/mol/°C. With 1 mol iron = 56 g, that's 0.45 J/g/°C. The potential energy of the steel is thus enough to heat the same steel to 2/0.45 = 4.4 °C.
The heat capacity of iron oxide (Fe2O3) is even larger (0.6 J/g/°C).
I don't know how to procede from here, but I think it is safe to say that only tiny tiny amounts of the available energy was expended to chip off surface material and heat it to red-hot and more.
Ps. I.was refering to.energy released.over time.
That's power
LSSBB'S whole point was that the collapses changed
The dynamics and there fore theses were not normal
Office fires
For 99.8% of their duration, those were "normal" office fires ("normal" in the sense that they were purely chemical events), and RJ Lee and I contend that many of the iron-rich spheres that ended in the dust were created by those fires.
The collapse dynamic may have added some more, but indeed you cannot, and more importantly: have not quantified if friction could have added significant amounts.
As was pointed out to me years ago,
You can not even know the amount of unburned
Carbon dust in.the towers that might be
Likely to produce dust explosions and
Reduction reactions in the collapses.
Now that is of course both true and highly relevant: There are myriads of chemical pathways in such large fires involving a very heterogenous mix of chemical substances that very little can be ruled out, very little can be proven or quantified.
Unless by experiment.
And here comes the main thrust of what I argue:
RJ Lee says that microspheres are expected from the "high temperature" event at the WTC - i.e. the fires.
McCrone shows iron-rich particles that he deems typical for various types of ashes and industrial and urban environments.
Even if they, or we, can't explain how these spheres are produced, it seems to be a matter of experience related by these eminent microscopy experts that dusts from high-temperature events, including large fires, leave iron-rich microspheres as a significant marker in the resulting dust. And this in the absence of thermite and collapses.
Chris has one metallurgist who says he does not find such spheres after fires. It's one expert against other experts.
I am not saying the spheres so found would come from ashes, I am saying it would come from heated, painted steel on heated, painted steel friction during the collapse, although in retrospect the painted (or primed) steel itself in the framing exposed to the fire would also be subject. Maybe even exposed steel also. So, you have experimentally analyzed these potential effects yourself and ruled them out as a source, or have references to such work?
There are paints involved in office fires too - you heat and burn them, you get ash.
I doubt this would add a significant quantity, but I could be wrong.
Paint layers are only 50 µm or so. There was less than 1 ton of steel primer per floor, and only a small percentage of that would heat suffiently to burn off.
ETA: Chemical reactions also during the collapse, as CC says.
Possible contribution, but pales in scale to the real fires.
Let me stress that you are all not wrong - no doubt paint and friction and chemical reactions sparked by collapse forces may
contribute to the sphere count - it all strengthens the overall argument LSSBB made elsewhere: It is silly beyond telling that truther believe spheres must come from thermite. Plenty of other possible sources are available and have not been ruled out by truthers.