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pi * diameter * diameter * length 260Q Volume = ———————————– cubic inches 4 A fully inflated 260Q is really 1.75″ in diameter, and 50″ long. 3.14 * 1.75 * 1.75 * 50 260Q Volume = ————————- = 120.3 cubic inches 4 1 cubic foot = 12 * 12 * 12 = 1728 cubic inches 120.3 260Q Volume in cubic feet = ——- = 0.
