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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Fermi (unit) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T748474 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Fermi (unit) Context triple: [Enrico Fermi, hasEponym, Fermi (unit)]
-
A.
Planck constant
The Planck constant is a fundamental physical constant that quantifies the relationship between the energy of a photon and the frequency of its associated electromagnetic wave, forming a cornerstone of quantum mechanics.
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B.
Kardashev scale
The Kardashev scale is a theoretical framework that classifies civilizations by the amount of energy they can harness and use, ranging from planetary to galactic levels.
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C.
Fermi energy
Fermi energy is the highest occupied energy level of a system of fermions at absolute zero temperature, playing a central role in determining the electronic and thermal properties of metals and semiconductors.
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D.
Eddington limit
The Eddington limit is the maximum luminosity a star or accreting object can have before radiation pressure overcomes gravity and drives away its outer layers.
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E.
Boltzmann constant
The Boltzmann constant is a fundamental physical constant that links temperature to energy at the particle level, playing a central role in statistical mechanics and thermodynamics.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Fermi (unit) Target entity description: 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.
-
A.
Planck constant
The Planck constant is a fundamental physical constant that quantifies the relationship between the energy of a photon and the frequency of its associated electromagnetic wave, forming a cornerstone of quantum mechanics.
-
B.
Kardashev scale
The Kardashev scale is a theoretical framework that classifies civilizations by the amount of energy they can harness and use, ranging from planetary to galactic levels.
-
C.
Fermi energy
Fermi energy is the highest occupied energy level of a system of fermions at absolute zero temperature, playing a central role in determining the electronic and thermal properties of metals and semiconductors.
-
D.
Eddington limit
The Eddington limit is the maximum luminosity a star or accreting object can have before radiation pressure overcomes gravity and drives away its outer layers.
-
E.
Boltzmann constant
The Boltzmann constant is a fundamental physical constant that links temperature to energy at the particle level, playing a central role in statistical mechanics and thermodynamics.
- F. None of above. chosen
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 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Fermi (unit) Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.