Convert kilometer to femtometer
Please provide values below to convert kilometer [km] to femtometer [fm], or Convert femtometer to kilometer.
1 km = 1.0000e+18 fm. To convert kilometer to femtometer, multiply the value by 1.0000e+18; to go the other way, divide by it (1 fm = 1.0000e-18 km). Both units measure length and appear in everyday as well as technical calculations, so switching between them quickly is often useful.
Quick Reference
- 1 km = 1.0000e+18 fm
- 1 fm = 1.0000e-18 km
- 10 km = 1.0000e+19 fm
- 100 km = 1.0000e+20 fm
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
| kilometer | femtometer |
|---|---|
| 1 km | 1.0000e+18 fm |
| 2 km | 2.0000e+18 fm |
| 3 km | 3.0000e+18 fm |
| 5 km | 5.0000e+18 fm |
| 10 km | 1.0000e+19 fm |
| 20 km | 2.0000e+19 fm |
| 50 km | 5.0000e+19 fm |
| 100 km | 1.0000e+20 fm |
| 500 km | 5.0000e+20 fm |
| 1000 km | 1.0000e+21 fm |
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.
Frequently Asked Questions
What is 1 kilometer in femtometer?
1 kilometer (km) = 1.0000e+18 femtometer (fm).
How do you convert kilometer to femtometer?
Multiply the kilometer value by 1.0000e+18. For example, 25 km × 1.0000e+18 = 2.5000e+19 fm.
What is 10 kilometer in femtometer?
10 km = 1.0000e+19 fm.
Which unit is larger, the kilometer or the femtometer?
The kilometer is the larger unit: 1 km = 1.0000e+18 fm.