Regarding cars 6 and 7, take a look at the quote I provided in my last post above above about those two elevator cars. They were at the least burned and the doors were blown off.
Originally Posted by bio
I cannot understand, why the cars 6, 7 parked on B1 were not destroyed by the explosive material, but the same explosive material could destroy walls in B4. Especially due to the fact, that the cars of 6, 7 blocked the shaft to 75 %. So the cars got 75 % of this explosive material, and the shaft only 25 %.
I will commend you for your honesty in admitting that you find it difficult to understand what happened. To understand how destructive flammable aerosol/vapor explosions and some of the mechanisms involved, I have compiled list of links for you to explore. The effect of deflagration of jet fuel in the elevator shafts of WTC must be considered mild compared to some of the examples below. The WTC disaster was so far outside our everyday experience that it is difficult to comprehend. And that is the problem for many I guess, it becomes to mind-bogglingly to comprehend, then it is easy to substitute lack of understanding with bombs to explain the events. Hopefully the examples below would help to put things into perspective.
First some sewer explosions involving hydrocarbons. Note that these examples involved the buildup of fuel over a relatively long time span, while in the WTC the jet fuel cloud was forced into the elevator shafts by the over pressure generated by the fireball in the impact zone.
Next is an example a backdraft generating a mild over pressure destroying a brick building and killing three firefighters:
Note the explanation on backdraft in the presentation. Corresponding article
here.
Example of a dust explosion:
The Buncefield Incident was large open air explosion that involved hydrocarbon vapor that flowed along the ground to the surrounding area before exploding (deflagration). You will find the reports here:
You should look at volume 1 of the final report, make sure that you read Annex 4 about open flammable cloud explosions, and note the discussion about turbulence. Lots of pictures. Also the report on explosion mechanism from 2007 could be of interest, but the essence is in annex 4.