The volume of a cube with a 4 foot edge is: 64 cubic feet.
42.875
The volume of a 4.11-foot cube is: 69.43 cubic feet.
A 3 foot cube has edges that are three feet long and a total volume of 27 cubic feet. 3 cubic feet describes a cube with edges the cube root of 3 long. (about 1.44225 feet)
Volume = 1*1*1 = 1 cubic foot
The volume is one cubic foot.
If you double the side, then the volume (which you've called size) will go up by the power of three, so a 2 foot sided cube (which has a volume of 8 cu ft) will go to a 4 foot sided cube with a volume of 64 cu ft. If you then halve that you will have 32 cuft and this will have a side which is the cube root of 32 which is 1.28 feet.
One cubic foot, the volume of a cube that is one foot long, one foot high and one foot wide.
A measurement of volume. A cubic foot, for example, has the volume of a cube which is 1 foot by 1 foot by 1 foot. Any shape that has the same volume as this is considered to have 1 cubic foot volume. (It could be 1 inch by 1 foot by 12 feet).
1 cubic foot (1728 cubic inches)
1*1*1 = 1 cubic foot
The volume of the cube is 12" * 12" * 12" = 1728 cubic inches. Though more simply, since 12" = 1 ft, the volume is 1ft * 1ft * 1ft = 1 cubic foot.