Convert kilometer to femtometer
Please provide values below to convert kilometer [km] to femtometer [fm], or Convert femtometer to kilometer.
How to Convert Kilometer to Femtometer
1 km = 1e+18 fm
Example: convert 15 km to fm:
15 km = 15 × 1e+18 fm = 1.5e+19 fm
Kilometer to Femtometer Conversion Table
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Kilometer
A kilometer is a unit of length in the metric system, equal to one thousand meters.
History/Origin
The term "kilometer" is derived from the Greek words "khilioi" (thousand) and "metron" (measure). The kilometer was first defined as part of the metric system in France in 1795.
Current Use
The kilometer is the most widely used unit of distance for road signs and travel distances in the world, with the notable exceptions of the United States and the United Kingdom.
Femtometer
A femtometer is a unit of length in the metric system equal to 10^-15 meters. It is also known as a fermi.
History/Origin
The prefix "femto-" for 10^-15 was adopted by the CGPM (General Conference on Weights and Measures) in 1964. The unit is also named after the physicist Enrico Fermi.
Current Use
The femtometer is primarily used in nuclear physics to measure the size of atomic nuclei.