None. A square inch has no volume.
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One square inch
Inches of water x 0.03613 equals pounds per square inch (psi).
2.78 square feet.
-- 1 square inch weighs nothing, since its volume is zero. -- If the square inch is one end of a vertical column of water, then the column weighs about [ 5pounds 31/3ounces ] for each 12-ft of its height.
One square inch is a square that is 1 inch wide and 1 inch tall.