Rosseland mean opacity
E46432
Rosseland mean opacity is an average measure of a material’s opacity weighted toward frequencies where radiation is most effectively transported, widely used in stellar and astrophysical radiative transfer calculations.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Rosseland mean opacity canonical | 5 |
| Rosseland mean opacities | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T365365 — 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: Rosseland mean opacity Context triple: [Radiative Transfer, relatedConcept, Rosseland mean opacity]
-
A.
Radiative Transfer
Radiative Transfer is a foundational scientific work that rigorously analyzes how radiation propagates through and interacts with matter, especially in astrophysical contexts.
-
B.
An Introduction to the Study of Stellar Structure
An Introduction to the Study of Stellar Structure is a foundational astrophysics monograph by Subrahmanyan Chandrasekhar that rigorously develops the theory of the internal structure and evolution of stars.
-
C.
Principles of Stellar Dynamics
Principles of Stellar Dynamics is a foundational astrophysics monograph by Subrahmanyan Chandrasekhar that rigorously develops the theoretical framework for understanding the gravitational dynamics and evolution of stellar systems such as star clusters and galaxies.
-
D.
The Lives of the Stars
"The Lives of the Stars" is an episode of the science documentary series *Cosmos: A Personal Voyage* that explores the birth, evolution, and death of stars and their role in shaping the universe.
-
E.
The Currents of Space
The Currents of Space is a science fiction novel by Isaac Asimov set in his Galactic Empire universe, exploring political intrigue, planetary exploitation, and social stratification on a distant world.
- 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: Rosseland mean opacity Target entity description: Rosseland mean opacity is an average measure of a material’s opacity weighted toward frequencies where radiation is most effectively transported, widely used in stellar and astrophysical radiative transfer calculations.
-
A.
Radiative Transfer
Radiative Transfer is a foundational scientific work that rigorously analyzes how radiation propagates through and interacts with matter, especially in astrophysical contexts.
-
B.
An Introduction to the Study of Stellar Structure
An Introduction to the Study of Stellar Structure is a foundational astrophysics monograph by Subrahmanyan Chandrasekhar that rigorously develops the theory of the internal structure and evolution of stars.
-
C.
Principles of Stellar Dynamics
Principles of Stellar Dynamics is a foundational astrophysics monograph by Subrahmanyan Chandrasekhar that rigorously develops the theoretical framework for understanding the gravitational dynamics and evolution of stellar systems such as star clusters and galaxies.
-
D.
The Lives of the Stars
"The Lives of the Stars" is an episode of the science documentary series *Cosmos: A Personal Voyage* that explores the birth, evolution, and death of stars and their role in shaping the universe.
-
E.
The Currents of Space
The Currents of Space is a science fiction novel by Isaac Asimov set in his Galactic Empire universe, exploring political intrigue, planetary exploitation, and social stratification on a distant world.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
astrophysical opacity measure
ⓘ
mean opacity ⓘ radiative transfer quantity ⓘ |
| appliesTo |
continuum opacity
ⓘ
line opacity ensembles ⓘ |
| assumes |
diffusion approximation for radiative transfer
ⓘ
local thermodynamic equilibrium ⓘ optically thick medium ⓘ |
| characteristic | emphasizes frequency ranges where radiation diffuses most efficiently ⓘ |
| contrastsWith | Planck mean opacity weighting by Planck function itself ⓘ |
| dependsOn |
chemical composition
ⓘ
density ⓘ frequency-dependent opacity ⓘ ionization state ⓘ temperature ⓘ |
| domain |
astrophysics
ⓘ
plasma physics ⓘ radiative transfer theory ⓘ stellar astrophysics ⓘ |
| introducedBy | Svein Rosseland ⓘ |
| introducedIn | 20th century ⓘ |
| mathematicalDefinition | harmonic mean of monochromatic opacity weighted by derivative of Planck function with respect to temperature ⓘ |
| namedAfter | Svein Rosseland ⓘ |
| relatedTo |
OP opacity project
ⓘ
OPAL opacity project ⓘ Planck mean opacity ⓘ equation of radiative transfer ⓘ flux-mean opacity ⓘ monochromatic opacity ⓘ radiation pressure ⓘ radiative diffusion approximation ⓘ radiative energy transport ⓘ stellar opacity tables ⓘ |
| roleInModels | controls radiative energy flux for given temperature gradient ⓘ |
| symbol | kappa_R ⓘ |
| unit | square meter per kilogram ⓘ |
| usedFor |
computing radiative temperature gradient in stars
ⓘ
determining convective stability criteria ⓘ estimating radiative conductivity ⓘ modeling energy transport in stellar interiors ⓘ |
| usedIn |
accretion disk models
ⓘ
astrophysical radiative transfer ⓘ interior models of stars ⓘ radiation hydrodynamics ⓘ stellar atmosphere modeling ⓘ stellar evolution models ⓘ stellar structure calculations ⓘ |
| weightingFunction | dB_nu_dT ⓘ |
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: Rosseland mean opacity Description of subject: Rosseland mean opacity is an average measure of a material’s opacity weighted toward frequencies where radiation is most effectively transported, widely used in stellar and astrophysical radiative transfer calculations.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Rosseland mean opacities