Length unit-meter (m). The unit of length refers to the basic unit for measuring spatial distance, which is formulated by human beings to standardize the length. Its international unit is "meter" (symbol "m"), and commonly used units are millimeter (mm), centimeter (cm), decimeter (dm), kilometer (km), meter (m), micron (micron) and nanometer (nm). Length units play an important role in various fields.

Extended data

I. Conversion of length units

1 decimeter = 0.000 1 kilometer (km) = 0. 1 meter (m) = 10 centimeter (cm) = 100 millimeter (mm).

1 cm =10mm = 0. 1 decimeter = 0.0 1 m = 0.0000 1 km.

Second, the public area unit

Square kilometers, square meters, square decimeters, square centimeters, square millimeters.

A square with a side length of 1mm and an area of 1mm2.

A square with a side length of 1 cm and an area of1cm 2.

A square with a side length of 1 decimeter and an area of 1 square decimeter.

A square with a side length of 1 m and an area of 1 m2.

A square with a side length of 1 km and an area of 1 km2.