It is a volume. A large bathtub might hold 21 cuft.
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21 cubic feet = 36,288 cubic inches = 1571/11 gallons
6,084*pi cubic feet or about 21,364.56 cubic feet.
(21 x 18 x 9) = 3,402 cubic feet = 126 cubic yards = about 25,448.73 gallons
Question is meaningless. Cubic feet are cubic feet!
1.2 (cubic feet) = 2073.6 cubic inches