Unit of length The unit of length refers to the basic unit for measuring spatial distance, and it is the basic unit 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.
Length unit conversion1km =1000 m.
1m = 10dm = 100cm
1 cm =10mm
1 mm = 1000 micron
1 mm = 1000000 nm
The origin of rice The definition of "rice" originated in France. The length of 1 meter was originally defined as one ten thousandth of the distance from the equator of the earth to the north pole on the meridian passing through Paris, and then the international meter origin was determined. With the deepening of people's understanding of measurement, the definition of the length of meter has been revised several times. Starting from 1983, the length of meter is defined as "the distance that light travels in vacuum in 1/299792458 seconds".
The above is my knowledge about length units and their conversion. I hope it will be helpful to everyone's study.