This compares a linear measurement to a volumetric measurement. A foot is 12 inches and a cubic foot is 12 inches long x 12 inches wide x 12 inches high.
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None. A foot is a measure of distance, a cubic foot is a measure of volume. The two measure different things and it makes no sense to try to convert from one to the other.
Find the volume of the pool (in cu ft) and multiply by the number of gallons of water per cubic foot. Volume = 9x13x3 = 351 cu ft 351 x 7.481 (gal per cu ft) = 2625.831 gal
1 cu foot = 1ft * 1 ft * 1 ft = 12 in * 12 in * 12 in = 1728 cubic inches. So 2592 cu inches = 2592/1728 = 1.5 cu ft
Cubic feet is a measure of volume (i.e. a cube measuring one foot x one foot x one foot). Pounds is a measure of weight (mass). Therefore the relationship between cubic feet and pounds is called density (lbs per cubic foot) and will vary for each substance: a gas (at atmospheric pressure) will have less than one pound per cubic foot, while a block of wood will have a density of approximately 60 lbs per cubic foot.