source: Architects and Engineers for 9/11 Truth Dec 11, 2011
Q:
What caused the “squibs”? Could they have been just puffs of dust being pushed out of the Towers by falling floors? Are they visual evidence of explosive charges?
A:
The isolated ejections 20-60 stories below the demolition front appear to be composed of pulverized building materials, including concrete. There was no known mechanism by which pulverized building materials being created up at the zone of destruction could have been transported so far down through the building and to the exterior. Air conditioning vents would not have tolerated such pressures, and there was no other “channel” in the building to deliver “compressed air”.
There is no reason, on the “dust puff” theory, for such blasts to be as isolated as they were. Massive air pressure which would delivered by the (missing) “pile driver” down through the elevator hoist ways and out through a given floor would have broken most or all windows on that floor – not created the highly focalized pin-point ejections that are seen on the videos. The breakage of one or two windows on a given floor would not have relieved enough pressure across an entire floor area to prevent the breakage of many other windows nearby.
Images like this one reveal that the squibs were not merely puffs of air, as they have the same hue and consistency as pulverized solid building materials
Multiple analyses have shown that the ejection speed of the squibs was too high, at 100+ mph, to have been the result of air pressure. These are explosive speeds. They have also been clocked at 160 to 200 feet per second.
Another problem with the “dust puff” theory is that the pulverized building materials would not have been transported so quickly. Air would have been pushed ahead of such materials, resulting in transparent puffs of air flowing through the freshly broken windows.
Physicist David Chandler has also shown that some of these ejections came from the corners of the buildings. Since there are no windows on the corners, these ejections could not have been the result of air pressure.
Posted by Brian 
