9/11 The unrevealed

It is not plausible that the steel columns are merged because the melting point of steel is over 1300 °.

A professor of materials science and engineering at the Massachusetts Institute of Technology, shows the groundlessness of this hypothesis, showing precisely how the collapse occurred not only to the mechanical impact of the planes, but also to the weakening of steel had to drain into the fire of fuel from the planes themselves.
To determine the structural collapse of the Towers were therefore mainly fires, although not merged the pillars (steel melts at higher temperatures) the softened significantly, causing them to lose much of their load capacity. The steel is deformed in fact already at 350 ° C and softens already at 500 ° C. According to the technical expertise, the large thermal expansion caused by the high temperature has greatly damaged the original balance of the Towers (probably causing a spill of the pillars from the foundation). By FEMA reports about the attacks on the Twin Towers also show that the plane crash caused the breakup of many of the pillars of the buildings, so that the static load was redistributed on a much smaller number of columns.