1 m = 10 decimeter; 1 decimeter = 10/0cm; 1 cm = 10/0mm; 1 mm = 1000 micron; 1 micron = 1000 nm.

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.

For example, centimeter is the unit for measuring length, gram is the unit for measuring mass, and second is the unit for measuring time. As an example of mathematics, it can also be said that 1 is the unit of natural number, and the fraction with the numerator of 1 is the unit of fraction.

Extended data:

Miles: 1 mile = 1760 yards =5280 feet = 1.609344 kilometers;

Code, yd): 1+0 code =3 feet =0.9 144 meters;

F, Fath, FA: 1 fathom =2 yards =1.8288m;

Furong: 1 wave =220 yards = 201.17m;

Foot (ft, plural): 1 foot = 12 inch =30.48 cm;

Inch (in): 1 inch =2.54 cm.