(70in by 80in) is the area of a flat surface, like a gigantic piece of paper.
It has no volume ... zero cubic feet ... until you also give it a height or a thickness.
"Volume", as in 'cubic feet', is just like "How much water can it hold?". If a tank only has a
bottom but no sides, then the answer is "zero".
... cubic square what? Meters? Yards? equals in cubic feet?
27 cubic feet per cubic yard.
Approximately .22 cubic feet.
1cc equals 0.00003531 cubic feet.
1,400 cubic meters equals about 49,441 cubic feet.
19 cubic feet equals about 32,832 cubic inches.
3,520 cubic inches equals 2.037 cubic feet.
Three cubic feet equals about 84,950.5 cubic centimeters.
1,950 cubic feet equals 55.22 cubic meters.
There are 50.265 cubic feet in 1.85 cubic yards.
36 cubic feet equals 925.7 dry quarts.
6.9 cubic feet equals 51.6 US gallons.