Mm mm, also known as millimeter (or millimeter), is a unit of length and rainfall, abbreviated as mm in English. Full name: millimeter. 1 0mm is equivalent to 1 cm, 1 00mm is equivalent to1decimeter, and1000mm is equivalent to1meter (this is the meaning of milli).

Common units of length:

Commonly used length units are: kilometers (km) > M > Decimeter > Cm > Millimeter > Micron > Nano > Pimi > Femtometer.

Among them, the rate of advance among kilometer, meter, millimeter, micron, nanometer, picometer and femtometer is 1000.

Then, 1 mm =1*1000 =1000 micron because there is an order of magnitude difference between millimeter and micron.