What are the units of length There are many units of length, such as meters, decimeters, kilometers... What are their abbreviations in English? What are the units of mass and what are their abbreviations in English?

What are the units of length There are many units of length, such as meters, decimeters, kilometers... What are their abbreviations in English? What are the units of mass and what are their abbreviations in English?

In the international system of units, the standard unit of length is "meter", denoted by the symbol "m"
Other length units include megameter (mm), kilometer (km), decimeter (DM), centimeter (CM), millimeter (mm), micron (μ m), nanometer (nm), etc
1Mm=1×10^6m 1km=1×10^3m 1dm=1×10^(-1)m 1cm=1×10^(-2)m 1mm=1×10^(-3)m 1μm=1×10^(-6)m
1nm=1×10^(-9)m
In China, the traditional units of length are feet, inches and feet
1m = 3 (feet) = 30 (inches) = 0.3 (feet)
In astronomy, "light year" is often used as the unit of length. It is the distance light travels in a year in vacuum, so it is also called light year
1 light year = 9.04653 × 10 ^ 12km