Planck constant
E28819
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.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Planck constant canonical | 31 |
| Planck constant h | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T225906 — 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 constant Context triple: [On a Heuristic Point of View Concerning the Production and Transformation of Light, usesConstant, Planck constant]
-
A.
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.
-
B.
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.
-
C.
Planck radiation law
Planck radiation law is a fundamental formula in quantum physics that describes the spectral distribution of electromagnetic radiation emitted by a black body in thermal equilibrium.
-
D.
Avogadro constant
The Avogadro constant is the fundamental physical constant that specifies the number of constituent particles, usually atoms or molecules, in one mole of a substance.
-
E.
Newtonian gravitational constant G
The Newtonian gravitational constant G is the fundamental physical constant that quantifies the strength of gravitational attraction between masses in classical and relativistic theories of gravity.
- 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 constant Target entity description: 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.
-
A.
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.
-
B.
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.
-
C.
Planck radiation law
Planck radiation law is a fundamental formula in quantum physics that describes the spectral distribution of electromagnetic radiation emitted by a black body in thermal equilibrium.
-
D.
Avogadro constant
The Avogadro constant is the fundamental physical constant that specifies the number of constituent particles, usually atoms or molecules, in one mole of a substance.
-
E.
Newtonian gravitational constant G
The Newtonian gravitational constant G is the fundamental physical constant that quantifies the strength of gravitational attraction between masses in classical and relativistic theories of gravity.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
fundamental constant
ⓘ
physical constant ⓘ physical constant ⓘ quantum constant ⓘ |
| appearsIn |
blackbody radiation theory
ⓘ
photoelectric effect theory ⓘ |
| appearsInEquation |
Bohr model energy levels
ⓘ
uncertainty principle ⓘ
surface form:
Heisenberg uncertainty principle
Planck radiation law ⓘ Planck–Einstein relation ⓘ Schrödinger equation ⓘ de Broglie wavelength formula ⓘ |
| category | Fundamental constants of nature ⓘ |
| CODATA2018Value | 6.62607015×10^-34 J·s (exact) ⓘ |
| definedAs | h / 2π ⓘ |
| definesRelation |
E = h f
ⓘ
E = h ν ⓘ |
| dimension | action ⓘ |
| dimensionSymbol | M L^2 T^-1 ⓘ |
| field |
physics
ⓘ
quantum mechanics ⓘ |
| fixedBy | 2019 SI redefinition of base units ⓘ |
| hasExactValue | 6.62607015e-34 joule second ⓘ |
| hasExactValueSI | 6.62607015×10^-34 J·s ⓘ |
| hasReducedForm | reduced Planck constant ⓘ |
| hasUnit | joule second ⓘ |
| hasUnitSymbol | J·s ⓘ |
| historicalYearIntroduced | 1900 ⓘ |
| introducedBy | Max Planck ⓘ |
| isCornerstoneOf |
photon theory of light
ⓘ
quantum theory ⓘ |
| isExactByDefinition | true ⓘ |
| isInvariant | Lorentz invariant ⓘ |
| isQuantumOf | action ⓘ |
| isUniversal | true ⓘ |
| namedAfter | Max Planck ⓘ |
| relatedConstant | reduced Planck constant ⓘ |
| relatesQuantity |
electromagnetic wave frequency
ⓘ
photon energy ⓘ |
| symbol |
h
ⓘ
ħ ⓘ |
| usedIn |
particle physics
ⓘ
quantum field theory ⓘ solid-state physics ⓘ spectroscopy ⓘ |
| usedToDefine |
Planck units
ⓘ
joule ⓘ kilogram ⓘ |
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 constant Description of subject: 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.
Referenced by (33)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Planck constant h
CODATA recommended values of the fundamental physical constants
→
includesConstant
→
Planck constant
ⓘ
subject surface form:
ħ
this entity surface form:
Planck constant h