Planck length
E32679
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.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Planck length canonical | 18 |
| Planck length ≈ 1.616255×10^-35 m | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T244043 — 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 length Context triple: [Newtonian gravitational constant G, usedToDefine, Planck length]
-
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.
reduced Planck constant
The reduced Planck constant (ħ) is a fundamental physical constant that quantifies the scale of quantum effects, commonly appearing in formulations of quantum mechanics and quantum field theory.
-
C.
Schwarzschild radius
The Schwarzschild radius is the critical distance from the center of a non-rotating, spherically symmetric mass at which its escape velocity equals the speed of light, defining the boundary of a black hole.
-
D.
Bekenstein bound
The Bekenstein bound is a theoretical limit in physics on the maximum amount of information or entropy that can be contained within a finite region of space with a given amount of energy.
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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: Planck length Target entity description: 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.
-
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.
reduced Planck constant
The reduced Planck constant (ħ) is a fundamental physical constant that quantifies the scale of quantum effects, commonly appearing in formulations of quantum mechanics and quantum field theory.
-
C.
Schwarzschild radius
The Schwarzschild radius is the critical distance from the center of a non-rotating, spherically symmetric mass at which its escape velocity equals the speed of light, defining the boundary of a black hole.
-
D.
Bekenstein bound
The Bekenstein bound is a theoretical limit in physics on the maximum amount of information or entropy that can be contained within a finite region of space with a given amount of energy.
-
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 (47)
| Predicate | Object |
|---|---|
| instanceOf |
Planck unit
ⓘ
physical constant ⓘ unit of length ⓘ |
| appearsIn |
black hole entropy calculations
ⓘ
generalized uncertainty principle formulations ⓘ theories of quantum spacetime foam ⓘ |
| approximateValue |
1.616255×10⁻³⁵ m
ⓘ
1.6×10⁻³⁵ metres ⓘ |
| associatedWith |
Planck energy
ⓘ
Planck mass ⓘ Planck scale ⓘ Planck time ⓘ |
| conceptualRole |
fundamental length scale of quantum gravity
ⓘ
scale where classical spacetime description breaks down ⓘ scale where quantum effects of gravity become significant ⓘ |
| definedBy | ℓ_P = √(ħG / c³) ⓘ |
| dependsOnConstant |
gravitational constant G
ⓘ
reduced Planck constant ħ ⓘ
linked to:
reduced Planck constant
speed of light c ⓘ |
| field |
cosmology
ⓘ
high-energy physics ⓘ quantum gravity ⓘ theoretical physics ⓘ |
| hasDimension | length ⓘ |
| implies | possible discreteness of spacetime at very small scales ⓘ |
| introducedInContextOf |
Max Planck’s natural units
ⓘ
linked to:
Planck units
|
| isSmallestMeaningfulScaleIn | many quantum gravity theories ⓘ |
| measurability | not directly measurable with current technology ⓘ |
| namedAfter | Max Planck ⓘ |
| orderOfMagnitude | 10⁻³⁵ metres ⓘ |
| relatedConcept |
Planck area
ⓘ
Planck units ⓘ Planck volume ⓘ |
| roleInBlackHoles | sets scale for Bekenstein–Hawking entropy area term ⓘ |
| roleInQuantumGravity | candidate minimal measurable length ⓘ |
| scaleComparison |
far below current experimental reach
ⓘ
much smaller than nuclear scale ⓘ much smaller than proton radius ⓘ |
| SIUnit | metre ⓘ |
| status | theoretical ⓘ |
| symbol |
l_P
ⓘ
ℓ_P ⓘ |
| usedIn |
black hole physics
ⓘ
loop quantum gravity ⓘ models of spacetime discreteness ⓘ quantum cosmology ⓘ string theory ⓘ |
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 length Description of subject: 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.
Referenced by (19)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Planck length