Micrometer (um)
The micrometer is a unit of length, used for microbiology, semiconductor manufacturing, and material science. Its symbol is um.
um
km
1 micrometer equals
| Kilometers | 1e-9 km |
| Miles | 6.21371e-10 mi |
| Meters | 0.000001 m |
| Feet | 0.00000328084 ft |
About the micrometer
The micrometer unit gained importance with the development of microscopy in the 19th century. It was formerly called a "micron" until the SI standardized the name.
In everyday use the micrometer appears in microbiology, semiconductor manufacturing, and material science. As a point of reference: a human red blood cell is about 7 micrometers across.