What are Square Microinches?
A square microinch is the area of a square one microinch (a millionth of an inch) on each side, so it is one trillionth of a square inch (10⁻¹²). In metric terms that is about 0.00064516 square microns.
What are Square Feet?
Square feet are units of measurement used to quantify area in the English/ Imperial system. Square feet is a unit commonly used in the imperial and US customary systems.
A square foot is a unit of area equal to a square with sides that are each one foot long. It is often used to measure the size of rooms, houses, and small plots of land.