1 sq ft = 144 sq inches
1 sq ft x 1 inch deep = 144 cubic inches / (231 cubic inches per gallon) = 0.6234 gallon (rounded)
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For a 1-inch line, there are approximately 0.01866 gallons per foot.
There are 15 (12-inch by 12-inch) squares in 15 square feet. Each square foot consists of 144 (12-inch by 12-inch) squares. Therefore, 15 square feet would contain a total of 2160 (12-inch by 12-inch) squares.
An inch and a linear inch are the same measurement. A linear inch is merely used to remove confusion between a linear inch, a square inch, and a cubic inch.
6.23377 US gallons.
To convert pounds per square feet to pounds per square inch, you need to divide by 144 since there are 144 square inches in a square foot. In this case, 32 pounds per square foot would be equal to 0.222 pounds per square inch.