We need to know the dimensions of the tube. The diameter AND the length of the tube. It takes o.465 yards per foot of length for a tube 4 feet in diameter. .
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4.074 cubic yards for every foot the slab is thick.
A yard (of dirt or concrete) is a volume of 1 cubic yard (1 yd)³, as the cubic is assumed in this context. Assuming a circle 7 feet across (diameter), then the radius is 3.5 feet = 1.16667 yards, and 8 inches = 0.2222 yards. So the volume of this is about 0.95 cubic yards. In concrete jargon it would be 0.95 yards.
You need 82/3 [cubic] yards for every foot deep that it has to be.
If you multiply that out, you'll get cubic units. It doesn't make sense to convert that to yards.
1 cubic yard = 27 cubic feet700 square feet x 1/2 foot = 350 cubic feet = 1226/27 cubic yards(12.963 cubic yards, rounded)