as someone who understands a little bit about jet fuel and operating temperatures, I got news broseefus, that shit can burn REALLY hot.
Did you know that special Platinum/Nickel superalloys are used in jet engines because they are the only alloys that can withstand the heat that is created? Did you know that these superalloys are also capable of withstanding heats nearly triple that of stainless steel (like in a skyskraper)?
Now, interestingly, these super high heats in jet engines are created by having a large amount of compressed air mixed in with the jet fuel, thus making the exhaust hotter.
Now, lets think back to the time of the German Me-262 jet fighter from WWII and the British Meteor. Both of these aircraft used some of the first succesful jet engines ever developed, and they operated at a compression ratio of about 3.14, which really isn’t all that much (3 times atmospheric pressure). The trick here is that at high altitudes, such as up around 25,000 feet, the air pressure is VERY low compared to sea level. So we can say that the operational air pressure in an early jet engine was slightly over that at sea level, and the heat that was generated was VERY capable of melting stainless steel.
As a matter of fact the German engine used a very ingenius active cooling system for their turbine blades, to prevent them from melting. Also an important consideration is that just because an alloy doesn’t melt, doesn’t mean that there isn’t some INCREDIBLE changes going on.
It’s obvious that the steel in the WTC was heated to a very high temperature, probably around a thousand degrees Celsius or about 1800 degrees Farenheit. At this temperature most steels go through changes at the atomic level, and the crystaline structure of the steel can change dramatically, from FCC to BCC.
This change at the atomic level gives the alloy a completely different strength and ductility. In order to keep this from happening, a steel would need to be used that would not undergo a phase change, and this would need to be considered in the construction of the building. I do not know for certain what type of steel was used, but odds are that there were most likely rivets, bolts, and welds that weren’t of a single phase steel, this would all compromise the integrity and the strength of the building at extremely high temperatures (which it probably wasn’t designed for).