Planck units
E154875
Planck units are a system of natural units in physics where fundamental constants like the speed of light, gravitational constant, and Planck constant are normalized to 1, providing a scale-free framework for describing physical laws.
All labels observed (6)
| Label | Occurrences |
|---|---|
| Planck units canonical | 13 |
| Planck unit system | 4 |
| Planck units system | 2 |
| Max Planck units system | 1 |
| Max Planck’s natural units | 1 |
| Planck system of units | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1348242 — 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: Planck units Context triple: [Planck constant, usedToDefine, Planck units]
-
A.
Planck length
The Planck length is the fundamental unit of length in quantum gravity, representing the scale at which classical concepts of space and time are expected to break down.
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B.
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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C.
Planck time
Planck time is the fundamental unit of time in the system of Planck units, representing the shortest meaningful interval of time according to current physical theories, where quantum effects of gravity become significant.
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D.
Gaussian units
Gaussian units are a cgs-based system of electromagnetic units widely used in theoretical physics, especially in electrodynamics, for their mathematical simplicity and symmetry.
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E.
Heaviside–Lorentz units
Heaviside–Lorentz units are a rationalized system of electromagnetic units commonly used in theoretical physics, especially in relativistic formulations of Maxwell’s equations and quantum field theory.
- 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: Planck units Target entity description: Planck units are a system of natural units in physics where fundamental constants like the speed of light, gravitational constant, and Planck constant are normalized to 1, providing a scale-free framework for describing physical laws.
-
A.
Planck length
The Planck length is the fundamental unit of length in quantum gravity, representing the scale at which classical concepts of space and time are expected to break down.
-
B.
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.
-
C.
Planck time
Planck time is the fundamental unit of time in the system of Planck units, representing the shortest meaningful interval of time according to current physical theories, where quantum effects of gravity become significant.
-
D.
Gaussian units
Gaussian units are a cgs-based system of electromagnetic units widely used in theoretical physics, especially in electrodynamics, for their mathematical simplicity and symmetry.
-
E.
Heaviside–Lorentz units
Heaviside–Lorentz units are a rationalized system of electromagnetic units commonly used in theoretical physics, especially in relativistic formulations of Maxwell’s equations and quantum field theory.
- F. None of above. chosen
Statements (53)
| Predicate | Object |
|---|---|
| instanceOf | system of natural units ⓘ |
| alsoKnownAs |
Planck units
ⓘ
surface form:
Planck system of units
natural units ⓘ |
| basedOnConstant |
Boltzmann constant
ⓘ
Coulomb constant ⓘ gravitational constant ⓘ reduced Planck constant ⓘ speed of light in vacuum ⓘ |
| characteristicScaleFor |
Planck-scale physics
ⓘ
quantum gravity effects ⓘ |
| definedBy | Max Planck ⓘ |
| field |
cosmology
ⓘ
quantum gravity ⓘ theoretical physics ⓘ |
| hasBaseQuantity |
Planck area
ⓘ
Planck charge ⓘ Planck current ⓘ Planck density ⓘ Planck energy ⓘ Planck force ⓘ Planck impedance ⓘ Planck length ⓘ Planck mass ⓘ Planck momentum ⓘ Planck power ⓘ Planck temperature ⓘ Planck time ⓘ Planck voltage ⓘ Planck volume ⓘ |
| namedAfter | Max Planck ⓘ |
| PlanckChargeApproxValueSI | 1.8755459×10⁻¹⁸ coulomb ⓘ |
| PlanckEnergyApproxValueSI | 1.9561×10⁹ joule ⓘ |
| PlanckLengthApproxValueSI | 1.616255×10⁻³⁵ meter ⓘ |
| PlanckMassApproxValueSI | 2.176434×10⁻⁸ kilogram ⓘ |
| PlanckTemperatureApproxValueSI | 1.416784×10³² kelvin ⓘ |
| PlanckTimeApproxValueSI | 5.391247×10⁻⁴⁴ second ⓘ |
| purpose |
eliminate arbitrary human-based units
ⓘ
provide a scale-free formulation of physical laws ⓘ simplify fundamental equations of physics ⓘ |
| setsToOne |
Boltzmann constant
ⓘ
surface form:
Boltzmann constant k_B
Coulomb constant 1/(4πϵ₀) ⓘ gravitational constant G ⓘ reduced Planck constant ⓘ
surface form:
reduced Planck constant ħ
speed of light in vacuum c ⓘ |
| simplifiesEquation |
Dirac equation
ⓘ
Einstein field equations ⓘ Einstein field equations ⓘ
surface form:
Friedmann equations
Schrödinger equation ⓘ |
| usedIn |
high-energy physics
ⓘ
loop quantum gravity ⓘ quantum field theory ⓘ string theory ⓘ |
| yearProposed | 1899 ⓘ |
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: Planck units Description of subject: Planck units are a system of natural units in physics where fundamental constants like the speed of light, gravitational constant, and Planck constant are normalized to 1, providing a scale-free framework for describing physical laws.
Referenced by (22)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Planck unit system
this entity surface form:
Max Planck’s natural units
this entity surface form:
Planck units system
this entity surface form:
Planck system of units
this entity surface form:
Planck unit system
this entity surface form:
Planck units system
subject surface form:
Planck length
this entity surface form:
Planck unit system
subject surface form:
Planck length
this entity surface form:
Planck unit system