hm²(square hectometre)

In the field of area, a square hectometre (hm²) is a unit of area measurement that is equal to a square with sides that are each 100 meters long. It is used to express the size or extent of a two-dimensional surface or space, such as land or a geographical region. One square hectometre is equal to 1 x 10^4 square meters (m²) or 100,000 square meters. It is a widely used unit in agriculture, forestry, and urban planning to describe the size of large areas.

µm²(square micrometre)

A square micrometre (µm²) is a unit of area in the metric system, commonly used to measure very small or microscopic areas. It represents a square with sides equal to one micrometre (1 µm) in length. A micrometre is one-millionth (1/1000000) of a meter or 0.001 millimetres.

In the field of area measurement, µm² is particularly useful for expressing the sizes of tiny objects or surfaces, such as in biology or material science, where dimensions of cells, bacteria, or minute particles need to be measured and compared.