Convert span (cloth) to femtometer
Please provide values below to convert span (cloth) [span] to femtometer [fm], or Convert femtometer to span (cloth).
How to Convert Span (Cloth) to Femtometer
1 span = 228600000000000 fm
Example: convert 15 span to fm:
15 span = 15 × 228600000000000 fm = 3.429e+15 fm
Span (Cloth) to Femtometer Conversion Table
| span (cloth) | femtometer |
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Span (Cloth)
A span is an obsolete unit of length, typically about 9 inches, based on the distance between the tip of the thumb and the tip of the little finger when the hand is fully extended.
History/Origin
The span has been used as a unit of measurement for thousands of years in many different cultures.
Current Use
The span is no longer a standard unit of measurement.
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.