a cubic inch is like a dice, 1 inch on height, width, and length,
a square inch is like a piece of paper that is 1 inch long and 1 inch wide
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An inch is a measure of distance or length. A square inch is a measurement of area. A cubic inch is a measure of volumen.
The question asks for a comparison that is not valid. It is like asking which is more 3 apples or 4 books? A square inch is a measure of area whereas a cubic inch is a measure of volume. They measure different things and it makes no sense to try and convert from one to the other.
An inch can be anything. It can be round, square, triangle or any number of shapes. But, a linear inch is a straight line only.
Steel is typically 490 lb/cubic foot. There are 1,728 square inches in a cubic foot which means that each cubic inch weighs about .284 pounds (just a bit over a quarter of a pound per square inch).
First, a square is a two-dimensional form, a cube is three-dimensional, and feet is a lineal measurement, ie., one-dimension, so no number of feet will ever equal a square or a cube. An inch is 1/12 of a foot. A square inch is 1/144 of a square foot. A cubic inch is 1/1728 of a cubic foot.