How Much Jet Fuel Actually Entered Each of the Twin Towers
WTC 2 - "Flight 175"
Boeing 767 fuel capacity........23980 US gallons
Flight 175 impact fuel total....415 US gallons...991 cubic feet (31% of capacity)
Fuel burned outside Tower (within fireball)....1483 US gallons...198 cubic feet (20% of fuel total)
Fuel left inside Tower..........5932 US gallons..793 cubic feet
Fuel left within impact zone....2966 US gallons..397 cubic feet (50% of remainder)
WTC 1 - "Flight 11"
Boeing 767 fuel capacity.........23980 US gallons
Flight 11 impact fuel total......8684 US gallons...1161 cubic feet (36% of capacity)
Fuel burned outside Tower (within fireball)....1737 US gallons...232 cubic feet (20% of fuel total)
Fuel left inside Tower...........6947 US gallons.....929 cubic feet
Fuel left within impact zone.....3474 US gallons...465 cubic feet (50% of remainder)
The size of the external fireball can be estimated using spheres of 63m diameter (width of the building). One of those spheres represents a volume 130924m³. I would estimate the external fireball of WTC2 as 400000-500000m³ (3-4 spheres) and the WTC1 fireball as 250000-300000m³.
Probably we have to add about 40000-50000m³ for the fireball inside the impact zone.
