The answer depends on the temperature and pressure.
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It is not possible to provide an exact number without knowing more specific information such as the pressure, temperature, and composition of the air. However, on average, there are approximately 2.5 x 10^19 molecules in a cubic centimeter of air at sea level.
A square inch does not have a specific number of inches in it because a square inch is a unit of area, not length. It represents the area of a square with sides that are each 1 inch long.
A 56-inch diameter circle has an area of about 17.06 square feet.
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.
A square millimetre is a unit of area. An inch is a unit of length. The two units are therefore incompatible.
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.