Millimeter, also known as millimeter (or millimeter), is the unit of length and rainfall, abbreviated as mm in English. 1mm is equivalent to one thousandth of 1mm (this means "milli").

The decimal relation is as follows:1mm = 0.1cm = 0.01decimeter = 0.001m = 0.000001km.

unit of length

When measuring the length of a line segment, you need to select a line segment as the measurement standard and specify its length as 1, which is called the length unit.

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.

When measuring, choose the appropriate length unit according to the actual needs. For example, the length of the runway is in meters, the distance between two cities is in kilometers, and the distance of long jump is in centimeters.