A non-conspiracy theory about 9/11 that deserves discussion:

[hedgehog]

6. The article posits that the debris more or less formed

melt furnaces around the remains of the planes.

As for the explosive power of aluminum, here's one experiment:

Alcoa Aluminium carried out an experiment under controlled conditions, in which 20 kilos of aluminium smelt were allowed to react with 20 kilos of water, to which some rust was added. The explosion destroyed the entire laboratory and left a crater 30 metres in diameter."

As for practical applications of this, my husband works in aluminum remelt. Sows are blocks of aluminum roughly
3ft x3ft x18". As they are cast, they may develop pinhole cavities or a center crack. We're not talking huge gaps; sometimes these flaws are invisible to the naked eye. When the sows are stored outside, rainwater can get into these cracks. Sometimes we're talking dew collection! My husband designs procedures and equipment to preheat the sows to above 212 degrees F and hold them there to drive off water as steam before the sow goes into the melt furnace. That's how serious the problem of water plus molten aluminum is.

We aren't talking about melting every last ounce of aluminum. If some of the aluminum melted and then hit water, it would have made an explosion. That explains why people saw explosions below the fire. A small explosion might have taken out some weakened structural steel. Once one floor collapsed on another, it was a chain reaction.