Oh really? Then why are there sources saying that there were 425,000 cubic yards...
What's wrong with 425,000 cubic yards?
And if 425,000 cubic yards are wrong, what does it matter to you? We still know the dimensions of everything if we even need to know.
How about there are probably sources that are mistaken and there are sources that are correct?
...and they existed before 9/11...
Huh?
... and the NCSTAR1 report does not even specify a total though they agree with those sources on the total amount of steel.
Why should NCSTAR1 report specify a total - what purpose could that possibly serve?
You see, I happen to know exactly how much money is my wallet - how many coins and bills of each denomination, but I could not specify the total weight of that money. So what?
Did you expect NIST to read your particular mind and provide numbers that you wish, for entirely unclear reasons, to be in the report?
And if NIST failed to pre-emptivly read your, psykeyhackr's mind to give you a number you would demand years after the report, does that mean the report is broken, invalid, worthless?
For some reason NIST says that WTC7 had 28,000 tons of steel.
No.
A somewhat curious relationship with each of the Twin Towers being twice as tall and having about 4 times as much steel.
Curious indeed, what you write there. You are not making any sense.
So did the lower half of the towers have 3 times as much steel as the upper half.
Don't know, and why is that relevant? What purpose would be served if you knew the answer to this?
The Eiffel Tower has to cope with the same gravity but does not have to support double it's own weight in concrete.
No, the Eiffel Tower has to cope with a lot less "gravity".
And anyway - so what?!? Totally different structure with totally different purposes facing different challenges.
Hint for you: If you expose enough of the Eiffel Tower - any part of it - to enough of a fire, it WILL collapse. Under gravity.
That's what gravity does to tall things that aren't stable any longer. It's really simple. You don't need to know the exact weight or how its distributed to understand the general principle.