

Convert Kilometers to Microns (km to µ) ▶ Conversion Table
How to convert1 micron (µ) = 0.000000001 kilometer (km). Micron (µ) is a unit of Length used in Metric system. Kilometer (km) is a unit of Length used in Metric system. Micron: A Unit of LengthA micron is a unit of length that is equal to one millionth of a meter. It is also known as a micrometer or a micrometre. The symbol for micron is µm. How to Convert MicronTo convert micron to other units of length, we need to use some conversion factors. Here are some common conversion factors for US Standard system and SI system:
Using these conversion factors, we can multiply or divide the number of microns by the appropriate factor to get the equivalent length in another unit. For example:
Where Micron is UsedThe micron is used in various fields and applications that require measuring very small distances or sizes. Some examples are:
The use of micron varies by country and region. For example:
Definition of the MicronThe micron is defined as one millionth of a meter. A meter is the base unit of length in the SI system. The SI system is an international system of units that is based on seven fundamental quantities: length, mass, time, electric current, temperature, luminous intensity, and amount of substance. The meter was originally defined as one tenmillionth of the distance from the equator to the North Pole along a meridian. However, this definition was not very precise and practical. Therefore, over time, the definition of the meter has changed several times based on different physical constants and standards. The current definition of the meter was adopted in 1983 by the General Conference on Weights and Measures (CGPM). It states that: The meter is the length of the path travelled by light in vacuum during a time interval of 1/299792458 second. Using this definition, we can derive that one micron is equal to: 1 µm = (1/299792458) / (1000000) second * (299792458 m / second) = (1/1000000) m = 0.000001 m History of MicronThe micron was first introduced in the late 18th century by French scientists who were developing a decimal system of units. They proposed a unit called micrometre that was equal to one millionth of a meter. However, this unit was not widely accepted or used at that time. In the early 19th century, British scientists adopted a similar unit called microinch that was equal to one millionth of an inch. This unit was more popular among Englishspeaking countries and regions. In the late 19th century, German scientists proposed a new unit called mikrometer that was also equal to one millionth of a meter. This unit was more consistent with the metric system and became more widely used in Europe and Asia. In the early 20th century, the International Bureau of Weights and Measures (BIPM) recommended using the term micrometer instead of micron or mikrometer to avoid confusion with other units. However, many people still preferred using micron as a shorter and simpler name. In 1960, the CGPM adopted the SI system as the official system of units for science and technology. The SI system used the term micrometer as the official name for the unit of length equal to one millionth of a meter. The symbol for micrometer was also standardized as µm. However, the term micron and its symbol µ were still widely used in many fields and applications. Therefore, in 1975, the CGPM decided to allow the use of micron and µ as alternative names and symbols for micrometer and µm. However, they also stated that these alternatives should be avoided in official documents and publications. Example Conversions of Micron to Other UnitsHere are some examples of converting micron to other units of length:
Kilometer  Unit of Distance / LengthUnit Symbol/Abbreviation: km Where the unit used in the World: The kilometer is used as a unit used to measure distances or lengths. Definition of the Unit: The kilometer (kilometre in UK spelling) is a unit of length/distance in the metric system (SI Unit system) equivalent to one thousand meters. 1 km is equivalent to 0.62137 miles. History of the Unit: Although the meter was defined in 1799 in France, the kilometer was first adopted for everyday use by the Dutch in 1817 under local name of the mijl. The myriametre (10000 meters) and "lieues de Poste" (Postal leagues, 4288 meters) were preferred to the "kilometer" for everyday use in France in 19th century. In the mid 19th century the kilometer was already in everyday use in the Italy and in Netherlands and the myriametre was still in use in France. The CIPM (The International Committee for Weights and Measures) officially abolished the prefix "myria" and the "myriametre" in 1935, leaving the kilometer as the recognised unit of length instead of myriametre. Where it's used: The kilometer is commonly used on road signs to indicate the distance to travel to a given location, on maps to indicate scale, for odometer indication in automotive industry. It is also the most popular unit for describing the distance between geographical points and locations. Equivalents in other units and scales:
1 km is equivalent to 0.621371 mi. Español Russian Français 
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