Home Quantities

☀

Part 77-8.1

☀

Part 7: Light and Radiation·66 entries

16 / 66

Section 7-82 entries

7-8.1radiant exitance, DEPRECATED: radiant emittance 7-8.2spectral radiant exitance

7-8.1

radiant exitance, DEPRECATED: radiant emittance

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-8.1

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-7/t7-8.1
urn:iso:std:iso:80000:-7:ed-2:en:item:7-8.1

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-8.1

IEC

urn:iec:std:iec:80000-7:2019:::item:7-8.1

Designations

ENradiant exitance

FRexitance énergétique

ENDEPRECATED: radiant emittance

FRDÉCONSEILLÉ: émittance énergétique

Symbol

M_{e}

(M)

Notation systems

Rendered

M_{e}

Rendered

(M)

AsciiMath

M_"e"

AsciiMath

(M)

LaTeX

M_{\text{e}}

LaTeX

( M )

Definition

density of exiting radiant flux with respect to area at a point on a real or imaginary surface, expressed by

M_{e} = \frac{d Φ_{e}}{d A}

where $Φ_{e}$ is radiant flux (radiant flux) and $A$ is the area (ISO 80000-3: Space and time) from which the radiant flux leaves

dérivée du flux énergétique sortant par rapport à l'aire, en un point d'une surface réelle ou fictive, exprimée par

M_{e} = \frac{d Φ_{e}}{d A}

où $Φ_{e}$ est le flux énergétique (radiant flux) et $A$ est l'aire (ISO 80000-3: Space and time) de la surface quittée par le flux énergétique

Units

\frac{W}{m^{2}}

watt per square metre

View related quantities →

k g \cdot s^{- 3}

kilogram per second cubed

View related quantities →

Notes

For Planckian radiation, $M_{e} = σ T^{4}$ where $T$ is thermodynamic temperature (ISO 80000-5: Thermodynamics) and $σ$ is the Stefan-Boltzmann constant (ISO 80000-1).

The corresponding photometric quantity is "luminous exitance" (luminous exitance). The corresponding quantity for photons is "photon exitance" (photon exitance).

Pour un rayonnement de Planck, $M_{e} = σ T^{4}$ où $T$ est la température thermodynamique (ISO 80000-5: Thermodynamics) et $σ$ est la constante de Stefan-Boltzmann (ISO 80000-1).

La grandeur photométrique correspondante est l'«exitance lumineuse» (luminous exitance). La grandeur photonique correspondante est l'«exitance photonique» (photon exitance).

Referenced by

spectral radiant exitance luminous exitance photon exitance emissivity emissivity at a specified wavelength

Concept HierarchyPendrill (2024)

M T⁻³M T⁻³ quantitiesLevel 0 · Kind

Broader concepts

◇ M T⁻³ quantities

Characterizes

● photon

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:t7-8.1

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-8.1
skosxl:prefLabel	"radiant exitance"@en
skosxl:altLabel	"DEPRECATED: radiant emittance"@en"M_"e""@en"(M)"@en
skos:definition	density of exiting radiant flux with respect to area at a point on a real or imaginary surface, expressed by [stem%unnu…
skos:note	For Planckian radiation, stem:[M_"e" = sigma T^4] where stem:[T] is thermodynamic temperature (<<iso80000-5>>) and stem:…
isq:hasUnit	W/m^2 (watt per square metre)kg*s^(-3) (kilogram per second cubed)
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