Fermi (unit)
E88967
The fermi is a unit of length equal to one femtometer (10⁻¹⁵ meter), commonly used in nuclear and particle physics to express sizes of atomic nuclei and subatomic particles.
Statements (37)
| Predicate | Object |
|---|---|
| instanceOf |
non-SI unit
→
unit of length → |
| alternativeName |
fermi
→
|
| approximateNuclearSizeExample |
typical atomic nucleus radius is a few fermis
→
|
| belongsToSystem |
cgs-based nuclear physics units
→
|
| category |
units of length
→
|
| definition |
1 fermi = 1 femtometer
→
1 fermi = 10^-15 meter → |
| dimension |
length
→
|
| etymology |
named to honor physicist Enrico Fermi
→
|
| fieldOfUse |
high-energy physics
→
nuclear engineering → nuclear physics → particle physics → |
| largerThan |
Planck length
→
|
| namedAfter |
Enrico Fermi
→
|
| orderOfMagnitude |
10^-15 meter
→
|
| relatedUnit |
angstrom
→
nanometer → |
| scaleDescription |
subnuclear length scale
→
|
| scaleRelativeToMeter |
1 fermi = 0.000000000000001 meter
→
|
| SIEquivalent |
femtometer
→
|
| smallerThan |
angstrom
→
nanometer → |
| status |
non-SI unit accepted for use in nuclear physics context
→
|
| symbol |
fm
→
|
| typicalMagnitudeInNuclearPhysics |
1–10 fermis for nuclear radii
→
|
| typicalScale |
neutron radius
→
nuclear radius → proton radius → |
| usageContext |
experimental nuclear physics
→
particle scattering experiments → theoretical nuclear physics → |
| usedFor |
nuclear distance scales
→
sizes of atomic nuclei → sizes of nucleons → sizes of subatomic particles → |
Referenced by (1)
| Subject (surface form when different) | Predicate |
|---|---|
|
Enrico Fermi
→
|
hasEponym |