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The femtometre (American spelling femtometer), symbol fm, [1] [2] (derived from the Danish and Norwegian word femten 'fifteen', Ancient Greek: μέτρον, romanized: metron, lit. 'unit of measurement') is a unit of length in the International System of Units (SI) equal to 10 −15 metres , which means a quadrillionth of one metre.
To help compare different orders of magnitude, this section lists lengths between 10 −15 meters and 10 −14 meters (1 femtometer and 10 fm). 1 fm – diameter of a neutron, approximate range-limit of the color force carried between quarks by gluons [6] [7] 1.5 fm – diameter of the scattering cross section of an 11 MeV proton with a target ...
The base unit in the International System of Units (SI) is the meter, defined as "the length of the path travelled by light in vacuum during a time interval of 1 ⁄ 299792458 seconds." [9] It is approximately equal to 1.0936 yd.
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Pelvimetry is the measurement of the female pelvis. [1] It can theoretically identify cephalo-pelvic disproportion, which is when the capacity of the pelvis is inadequate to allow the fetus to negotiate the birth canal. However, clinical evidence indicate that all pregnant women should be allowed a trial of labor regardless of pelvimetry ...
Femtotechnology is a term used in reference to the hypothetical manipulation of matter on the scale of a femtometer, or 10 −15 m. This is three orders of magnitude lower than picotechnology , at the scale of 10 −12 m, and six orders of magnitude lower than nanotechnology , at the scale of 10 −9 m.