What was the temperature of the 9/11 fire?

according to videos I have seen regarding this event the fire couold not have generated the temperatures necessary to melt the steel supports. The towers were apparently (and evidently) collapsed using explosives... they were deomolished !!

Kerosene in jet engines reaches very high temperatures due to being under high pressure and subject to continuous provision of fuel and a lot of oxygen. But jet fuel burning uncontained burns at a relatively low temperature that couldn't, for instance, melt steel. The smoke from the towers, after the initial fireball, suggested that the fires were oxygen starved and relatively cool. Furthermore, steel is a good conductor of heat and would have dissipated it very quickly. Heat from the fires would have gone upwards and could not have gone down so far as to melt the steel columns in the basement. I have an open fire using coal and wood and in the winter it sometimes glows white hot - but the iron grate doesn't melt, even though in direct contact for a long time.

500 F is complete nonsense. Even a typical house fire, where the only fuel is the structure itself, can burn at 1200F. According to a report by actual engineers published in an actual engineering technical journal (edited, but not peer reviewed) rather than a random website, it was probably reached a maximum temperature of 800 C (1472 F). However, another study (from the peer-reviewed Fire Safety Journal) found that it still could have failed even if the columns never exceeded 500 C

Jet fuel (kerosene) burns at 500-599 F in open air. The smoke coming out of the towers was dark. Dark smoke is an indication of an oxygen starved fire. The fire was not burning hot at all. http://en.wikipedia.org/wiki/Jet_fuel