Kvadratmillimeter

Kvadratmillimeter, or square millimeter, is a derived unit of area in the metric system. It represents the area of a square with sides measuring 1 millimeter. The symbol for this unit is mm^2. The square millimeter is a small-area unit commonly used in electronics, engineering, and manufacturing to express the size of tiny surfaces or cross-sectional areas.

One square millimeter equals one millionth of a square meter, that is, 1 mm^2 = 1 × 10^-6 m^2. It is also related to square centimeters and square inches: 1 mm^2 = 0.01 cm^2, since 1 cm = 10 mm. In square inches, 1 in^2 equals 645.16 mm^2. These relationships help convert measurements between metric and imperial systems.

Common applications include specifying the cross-sectional area of wires and cables (for example, a 2.5 mm^2 copper wire), the die size of semiconductor components, contact areas on small electronic parts, and surface areas in microfabrication. The unit is favored for describing very small areas where precise, metric-based measurements are needed.

The term kvadratmillimeter is used in some Scandinavian languages as a direct translation of square millimeter. It is important to distinguish mm^2 from cubic millimeters (mm^3), which denote volume rather than area.

In summary, the square millimeter is a concise, standard SI unit for small areas, widely used in science and engineering for precise measurements of tiny surfaces.