Quote:
Originally Posted by shazeep
...um, and also "stand down." ok. And any 1st year engineer can explain the impossibility of that building coming down at free-fall speed without help. It cannot happen. It is impossible. Just make a 4 sided column out of wire screen, soak a pencil in diesel, light it up, and poke it through the screen to see. The analogy is very close, except of course the screen will melt much quicker than the latticed steel beams.
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"Steel is just the element iron that has been processed to control the amount of carbon. Iron, out of the ground, melts at around 1510 degrees C (2750°F). Steel often melts at around 1370 degrees C (2500°F)
The steel structure of the World Trade Center would not have to melt in order for the buildings to lose their structural integrity. Steel can be soft at 538°C (1,000°F) well below the burning temperature of jet fuel."
http://education.jlab.org/qa/meltingpoint_01.html
Jet A-1 Jet A
Flash point 38 °C (100 °F)
Autoignition temperature 245 °C (473 °F)[10]
Freezing point −47 °C (−53 °F) −40 °C (−40 °F)
Max adiabatic burn temperature 2,500 K (2,230 °C) (4,040 °F) Open Air Burn temperature: 1,030 °C (1,890 °F)[11][12][13]
Density at 15 °C (59 °F) 0.804 kg/L (6.71 lb/US gal) 0.820 kg/L (6.84 lb/US gal)
Specific energy 43.15 MJ/kg 43.02 MJ/kg
Energy density 34.7 MJ/L 35.3 MJ/L
http://en.wikipedia.org/wiki/Jet_fuel
Go find another analogy.
That one does not work.