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Section 7-33 entries

7-3.1radiant energy density 7-3.2spectral radiant energy density in terms of wavelength 7-3.3spectral radiant energy density in terms of wavenumber

7-3.1

radiant energy density

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-3.1

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-7/t7-3.1
urn:iso:std:iso:80000:-7:ed-2:en:item:7-3.1

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-3.1

IEC

urn:iec:std:iec:80000-7:2019:::item:7-3.1

Designations

ENradiant energy density

FRénergie rayonnante volumique

Symbol

w

(ρ_{e})

Notation systems

Rendered

w

Rendered

(ρ_{e})

AsciiMath

w

AsciiMath

(rho_"e")

LaTeX

w

LaTeX

( \rho_{\text{e}} )

Definition

volumetric density of radiant energy, expressed by

w = \frac{d Q_{e}}{d V}

where $Q_{e}$ is radiant energy (radiant energy <electromagnetism>) in an elementary three-dimensional domain and $V$ is the volume (ISO 80000-3: Space and time) of that domain

densité volumique de l'énergie rayonnante, exprimée par

w = \frac{d Q_{e}}{d V}

où $Q_{e}$ est l'énergie rayonnante (radiant energy <electromagnetism>) dans un domaine tridimensionnel élémentaire et $V$ est le volume (ISO 80000-3: Space and time) de ce domaine.

Units

\frac{J}{m^{3}}

joule per cubic metre

View related quantities →

k g \cdot m^{- 1} \cdot s^{- 2}

kilogram per metre second squared

View related quantities →

Notes

Radiant energy density within a Planckian radiator is given by

w = \frac{4 σ}{c_{0}} T^{4}

where $σ$ is the Stefan-Boltzmann constant (ISO 80000-1), $c_{0}$ is speed of light in vacuum (ISO 80000-1) and $T$ is thermodynamic temperature (ISO 80000-5: Thermodynamics).

L'énergie rayonnante volumique d'un radiateur de Planck est donnée par

w = \frac{4 σ}{c_{0}} T^{4}

où $σ$ est la constante de Stefan-Boltzmann (ISO 80000-1), $c_{0}$ est la vitesse de la lumière dans le vide (ISO 80000-1) et $T$ est la température thermodynamique (ISO 80000-5: Thermodynamics).

Referenced by

spectral radiant energy density in terms of wavelength spectral radiant energy density in terms of wavenumber

Concept HierarchyPendrill (2024)

L⁻¹ M T⁻²pressure-type quantitiesLevel 0 · Kind

Broader concepts

◇ pressure-type quantities

Ontology
isq:Quantity smart:TermEntry

Class Hierarchy

smart:Entity smart:TermEntryisq:Quantity

A physical quantity as defined in ISO/IEC 80000, with associated symbols, definitions, and units of measurement.

Instance IRI

isq:t7-3.1

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-3.1
skosxl:prefLabel	"radiant energy density"@en
skosxl:altLabel	"w"@en"(rho_"e")"@en
skos:definition	volumetric density of radiant energy, expressed by [stem%unnumbered] ++++ w = ("d"Q_"e")/("d"V) ++++ where stem:[Q_"e"…
skos:note	Radiant energy density within a Planckian radiator is given by [stem%unnumbered] ++++ w = (4 sigma)/c_0 T^4 ++++ where…
isq:hasUnit	J/m^3 (joule per cubic metre)kgm^(-1)s^(-2) (kilogram per metre second squared)
isq:hasDimension	isq:Dimension
smart:hasBindingnessType	bindingness-type:normative
dcterms:isPartOf	isq:part-7

Related Entities

isq:QuantityShape isq:part-7 isq:Unit isq:Dimension isq:hasDimension smart:TermEntry