Interestingly, water is a little less than 1000 times as dense as air.
Given that the Landmark dust settles, that means it's more dense than air. therefore, TS, in order for you to be correct, the WTC Dust would have to be more dense than water.
Let's look at that.
The dimension of each tower were 63m x 63m x 417m, giving a total volume of 1,655,073m
3.
Based on the density of water at 20
oC (998.2071kg/m
3) that would give us a total mass of 1,652,105,619kg, or 1.6 million tonnes (1.8 million tons).
But how heavy WERE the towers?
Well, for that answer, I turned to an
article by Thomas W. Eagar and Christopher Musso that appeared in JOM, 53 (12) (2001), pp. 8-11.
JOM is the monthly technical journal published by TMS - The Minerals, Metals & Materials Society - an International professional organisation for professional scientists and Engineers.
Thomas W. Eagar is the Thomas Lord Professor of Materials Engineering and Engineering Systems, and Christopher Musso is a graduate research student, both at the Massachusetts Institute of Technology MIT)
According to them each tower weighed roughly 500,000t. That would give the errect towers a density of 302kg/m
3.
What this means is for your "1000x as dense" assertion to be true, the dust from the WTC collapses would have to be over THREE TIMES as dense as the standing towers were.
Even ignoring the rather blatantly obvious fact that the dust clouds had many magnitudes the volume of the standing towers, only a truely ignorant person would fail to see the absurdity of this notion. Thus, you are left with two options.
1) You 1000x as dense claim is utterly, irrefutably false, and more so incorrect by at least an order of magnitude
OR
2) During the collapse each of the towers accquired additional mass equating to multiple times its previous mass.
I would propose that one of these explanations indicates sanity, and one does not.
-Gumboot