A square mil is a unit of area measurement that is equal to one millionth of a square inch. It is often used in fields such as engineering and electronics to specify very small areas, especially in relation to the cross-sectional area of conductors or other components. To be more precise, 1 square mil is defined as the area of a square with sides of one mil (0.001 inches) in length. In mathematical terms: 1 square mil = \( (0.
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