The order of ancient length units from large to small.

The traditional units of length in China are Li, Zhang, Chi, Inch, Xun, Jie, Fu, Zhi, Yi, Bu, Chang, Ya, Yan, Ji, Rail, Luo, Millimeter, Li and Min. The basic transformation relationship is as follows:

1 ft = 10 ft; 1 ft = 10 inch; 1 inch = 10 points; 1 = 10%;

1 sheet ≈ 3.33m; 1 ft ≈3.33 decimeter; 1 inch ≈3.33 cm;

1km = 1000m； 1 meter (m) = 100 cm; 1 cm =10mm

1 Li = 150 sheets = 500m; 2 Li = 1 km (1000 m).

International extended information unit

In the international system of units, the standard unit of length is "meter", which is represented by the symbol "m".

1960 The 1st International Metrology Conference: "The length of the meter is equal to 1650763.73 times of the radiation wavelength passing between krypton -86 atoms 2P 10 and 5d 1 levels in vacuum"? . Generally speaking, "meter" is generally defined as the length of the distance traveled by light in the time interval of 1/299792458 s in vacuum.

The unit of length adopted in China is consistent with the international system of units, that is, "meter" is the legal unit of length measurement in China. ?

Commonly used unit

Commonly used length units are: kilometer {kilometer} (km), decimeter (dm), centimeter (cm), millimeter (mm), micron (micron), nanometer (nm), picometer (pm) and femto meter (fm).

Baidu encyclopedia-length unit