Microns and millimeters are units of length. Micron is a unit in the international system of units, expressed as micron, and millimeter is a commonly used unit of length. 1 mm is equal to 1000 micron, that is, 1mm= 1000um. Therefore, 1um is equal to 0.001mm.

The conversion of length units is widely used in production and science and technology, such as the size of electronic components, the accuracy requirements in industrial processing, the distance and area in medical images, etc. Unit conversion is a basic mathematical operation. Mastering unit conversion can facilitate the conversion and calculation of various units of measurement.