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Originally posted by GenRadek
reply to post by rhunter
Well maybe if you would bother reading the links I posted earlier, you may see and learn something about chemistry. Rather than ridicule what you obviously dont understand, how about read it, and then let your mind grow. Knowledge is power.
But I guess things you dont understand will always seem like magic or voodoo. Sad really, as basic chemistry is being mocked by you. Oh well. I guess if you cannot figure something as simple as what rust (oxidation) is in terms of chemistry then how are you suppose to understand more complex issues like therm*te and other higher forms of sciences? not trying to insult you, but seriously questioning your reasoning.
Oh and here is a hint as to what combustion is:
combustion
Noun
1. the process of burning
2. a chemical reaction in which a substance combines with oxygen to produce heat and light [Latin comburere to burn up]
And for fun, what is rust? (ie oxidation) And how does it form?
[edit on 4/24/2009 by GenRadek]
In an analogy, two concepts, objects, or events proposed to be similar in nature (A and B) are shown to have some common relationship with another property. The premise is that A has property X, and thus B must also have property X (due to the assumed similarity of A and B). In false analogies, though A and B may be similar in one respect (such as color) they may not both share property X (e.g. size). [1] Thus, even if bananas and the sun appear yellow, one could not conclude that they are the same size. One who makes an invalid analogy or comparison is often said to be "comparing apples and oranges".
WW,
I see that you still do not understand what I have written. Perhaps you should show, point by point why Jone's paper is good science.
We often used the words oxidation and rust interchangeably, but not all materials which interact with oxygen molecules actually disintegrate into rust. In the case of iron, the oxygen creates a slow burning process, which results in the brittle brown substance we call rust. When oxidation occurs in copper, on the other hand, the result is a greenish coating called copper oxide. The metal itself is not weakened by oxidation, but the surface develops a patina after years of exposure to air and water.
The conditions for iron to rust can then be easily deduced. The rusting of iron is at times referred to as slow burning. Why?
Rusting of iron affects the quality of the iron. It is like the decay of the iron. Rusting costs the community a great deal of money. It has to be prevented otherwise articles made of iron will decay away. The students should then be guided to search for cases of iron rusting in their environment. What materials rust and where are they found.
All combustion reactions (such as the burning of coal) are exothermic. Incredibly, the reaction between iron and moist air that produces rust is a very exothermic process and generates lots of heat. Unfortunately, this particular reaction takes place so slowly that the liberation of heat is undetectable. Fireworks, explosives and fuels, on the other hand, all involve very fast and extremely exothermic chemical reactions.
For example, an exothermic reaction occurs when a piece of steel rusts. Rust is iron oxide (Fe2O3), which is produced by the reaction of iron (Fe) with oxygen (O2). This reaction releases heat and is therefore, exothermic. However, it takes place at such a slow pace that it is impossible to observe a difference of temperature on the piece of steel. Fire is an exothermic reaction that occurs much faster.
Sometimes a big load of iron in a ship can get hot. The heat can even set other materials on fire.
That’s because the iron is rusting, which means it is burning very, very slowly. Iron rusts in a chemical reaction called oxidation. That means the iron reacts with oxygen gas from the air. Oxidation is the chemical reaction that occurs when anything burns in air.
Like most oxidations, rusting gives off heat. But rusting is a slow process that gives off very little heat. It becomes a fire hazard only when a lot of iron is allowed to rust in a closed-up space.
......it is important to understand that general rule in chemistry that most chemical reactions (e.g., oxidation of iron) are accelerated by higher temperatures. This is especially true of iron oxidation. This means, that the hotter iron metal in contact with oxygen is, the faster it will oxidize (burn). For example, it is a familiar sight at iron foundries to see hot iron rust forming instantaneously on red-hot iron beams. This hot rust usually falls off spontaneously (because of the difference in thermal expansion properties between iron and rust). Meaning, a hot iron beam, if combined with a large enough number of other hot iron beams in a confined or semi insulated pile (e.g., covered with cement dust), will burn CONTINUOUSLY until it consumes itself, (and thus will appear to have been "vaporized" to those not looking for the rust residue).
Originally posted by pteridine
The energy for thermite is low because the weight of the oxide is high. Burning aluminum in air would have a much higher value.
Originally posted by GenRadek
reply to post by rhunter
So I see that you have obviously missed what the person was saying. First off, what is rust and how is it formed? What is oxidation? Do you even understand that part? Iron combines with oxygen. Rust is formed.
Oh by the way, it wasnt a swing and a miss.
All combustion reactions (such as the burning of coal) are exothermic. Incredibly, the reaction between iron and moist air that produces rust is a very exothermic process and generates lots of heat. Unfortunately, this particular reaction takes place so slowly that the liberation of heat is undetectable. Fireworks, explosives and fuels, on the other hand, all involve very fast and extremely exothermic chemical reactions.
For example, an exothermic reaction occurs when a piece of steel rusts. Rust is iron oxide (Fe2O3), which is produced by the reaction of iron (Fe) with oxygen (O2). This reaction releases heat and is therefore, exothermic. However, it takes place at such a slow pace that it is impossible to observe a difference of temperature on the piece of steel. Fire is an exothermic reaction that occurs much faster.
Like most oxidations, rusting gives off heat. But rusting is a slow process that gives off very little heat. It becomes a fire hazard only when a lot of iron is allowed to rust in a closed-up space.
Although I can tell I am likely wasting my time even attempting to converse with someone with such clearly deficient faculties of logic, did anyone notice that recurring "very little heat" pattern in the majority of those sources?
To save yet more "semantical simon says" rhetoric from GenRadek, what is fire?
www.merriam-webster.com...
"Function:
noun
Usage:
often attributive
Etymology:
Middle English, from Old English fȳr; akin to Old High German fiur fire, Greek pyr
Date:
before 12th century
1 a (1): the phenomenon of combustion manifested in light, flame, and heat.
2 a: fuel in a state of combustion (as on a hearth)
3 a: a destructive burning (as of a building)"
Note that is a logical AND with "light, flame, and heat" in 1 a (1) above. I am not confident in GenRadek's understanding of this either however.
Show me an example of where rusting of iron (a SUB-SET of oxidation reactions, like combustion reactions, but these ARE NOT necessarily EQUIVALENT) produces "light, flame, and heat" [at low temperature]. Let's take "low temperature" to mean room-temperature-ish (T
I take it that your response means that you have no rationale for supporting the paper.
Jones' team are not answering emails or responding to criticisms at this time, as Turbofan is discovering.
Refuting a paper that was not accepted for publication in a peer reviewed journal is pointless. It already has been refuted by denial of publication.
Like most oxidations, rusting gives off heat. But rusting is a slow process that gives off very little heat. It becomes a fire hazard only when a lot of iron is allowed to rust in a closed-up space.
Originally posted by Griff
NIST found that one floor had a factor of safety of 11. That's 11 times it's own load.
But, you will say dynamic load and I'll tell you that NIST also found that each floor could hold 6 in dynamic load.
So, tell me again how 6 floors worth of vertical support just gave way all at once again. You may say that the cap was over 6 stories tall. But, then I'd have to ask you what caused the cap to become detached in the first place to cause it to fall.
Not really. The vertical support columns held the floors from day one. No amount of floor failure would stress the columns anymore than they already are. Other than what is stated below.
But, then we have to remember that the interior core columns were internally braced. What happened to the core that made it come down with the floors?
Originally posted by Griff
Can this theory of yours be recreated in a laboratory?
Originally posted by GenRadek
turbofan, as you can see in the video, the area that was hinged did snap.
Now as it began its descent, is also impacts the area below, if it didnt already start collapsing from the failures of the floors from the other side.
When the hinge snaps, it means it is no longer connected to the rest of the tower.
The top section is already on the way down.
Also it is important to notice that the "hinge" could have also been the core columns failing on one side, with the exterior columns connecting and holding up that side. Its important to remember the floor and columns design of the WTCs.
Originally posted by Griff
Originally posted by pteridine
The energy for thermite is low because the weight of the oxide is high. Burning aluminum in air would have a much higher value.
So, you are saying that aluminum itself would burn higher than thermite? Why even bother mixing in the iron oxide to make thermite then? Wouldn't that save a lot of time and money?
Originally posted by GoodOlDave
No, that isn't what I am going to say. What I actually am going to say is that the floors began collapsing in WTC 1 at the 96th-ish floor, and in WTC 2 at the 82nd-ish floor, both where the aircraft had hit. Each tower had 110 floors, which means in WTC 1 the floor below this was hit with 14 floors, and in WTC 2, the floor below was hit with 27 floors. Since you yourself admit the floors had a safety factor of 11 and a dynamic load of 6, the best source of proof I have that the load capacity of the floors was insufficient to withstand the forces of the falling floors above is, well, you, actually.
Ummm, no they didn't. It was the horizontal support braces that held the floors from day one. Perhaps you meant to say the vertical support columns held the horizontal support braces from day one, but the strength of the vertical columns still would add no strength to the horizontal braces.
As I said before, one merely needs to look at the photos your partner evilaxis had posted to show what happened to the core that made it come down with thre floors. The besyt source of evidence to prove what I'm stating concerning the columns is HIM.