Square Nanometer [nm²]
A square nanometer (nm²) is a unit of area equal to a square with sides 1 nanometer long (1 nm = 1 billionth of a meter, or 10⁻⁹ m).
It’s used to measure extremely tiny areas, like the surface of molecules or nanomaterials.
1 nm² = 1 × 10⁻¹⁸ m².
Arpent
An arpent is a traditional French unit of land area and length, still used in some regions like Louisiana and parts of Canada.
As an area, 1 arpent ≈ 0.85 acres ≈ 3,420 square meters.
As a length, 1 arpent ≈ 192 feet (about 58.47 meters).
Arpents were commonly used in colonial land surveying and property descriptions, especially in French-influenced areas.