On the application of an expert in the field of material, a mixture of water (from the sprinkler system), and molten aluminum from the airframe, apparently, was the cause of the explosions that brought down the twin towers of September 11, 2001.
"If my theory is correct, tonnes of aluminum flowed through the tower where made contact with a few hundred liters of water," - said Christian Siemens from SINTEF, an independent institution in Norway.
"The experience of other disasters and experiments that were conducted aluminum industry, we know that reactions of this sort lead to massive explosions."
According to the official report, the cause of the collapse was the overheating and failure of load-bearing steel beams. Simensen rejects this explanation.
He said that taking into account the amount of molten metal explosions would be so powerful that they would put up whole sections of these buildings.
This in turn led to the fact that the tower upper section, the lower would be dropped.
Weight of the top floors would be enough to add up the lower part of the building as a house of cards.
The scenario with aluminum and water, may also explain the nature of the origin of explosions inside the buildings, which were distributed just before the collapse and contributed to the outbreak of conspiracy theories, according to which the building was deliberately undermined.
Simensen presented his theory at an international materials technology conference in San Diego, California. His calculations, he published in the journal Aluminium International Today.
"According to the aluminum industry, in 1980 there were more than 250 aluminum-water explosions," - he said.
During controlled experiment conducted Alcoa Aluminium, 20 kilograms of molten aluminum to react with 20 liters of water and a small amount of rust.
"The explosion completely destroyed the laboratory and left a crater 30 meters," - said Simensen.
For comparison, each of crashed aircraft contained 30 tons of aluminum, in accordance with its calculation.
Shards, especially plaster, which blocked the transfer of heat, could form something like a shield, protecting the rest of the building.
But at the same time, this would create a very hot, like the stove, the area around the aircraft, which was heated burning fuel.
When heated to 750 degrees Celsius, an alloy of aluminum and magnesium, which consisted of the skeleton of the aircraft, "becomes as liquid as water," - said Simensen.
According Simensena, if this theory is correct, then it is necessary to take measures to prevent similar accidents in the future.
"It is possible to develop a system of sprinklers instant devastation," - he said
The launch filled with fire retardant, which would have covered the airframe, would also prevent the melting of the alloy.