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Section 7-316 entries

7-31.1absorptance 7-31.2luminous absorptance 7-31.3reflectance 7-31.4luminous reflectance 7-31.5transmittance 7-31.6luminous transmittance

7-31.1

absorptance

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-31.1

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-7/t7-31.1
urn:iso:std:iso:80000:-7:ed-2:en:item:7-31.1

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-31.1

IEC

urn:iec:std:iec:80000-7:2019:::item:7-31.1

Designations

ENabsorptance

FRfacteur d'absorption

Symbol

α

a

Notation systems

Rendered

α

Rendered

a

AsciiMath

alpha

AsciiMath

a

LaTeX

\alpha

LaTeX

a

Definition

quotient of absorbed radiant flux and incident radiant flux, expressed by

α = \frac{Φ_{a}}{Φ_{m}}

where $Φ_{a}$ is absorbed radiant flux (radiant flux) and $Φ_{m}$ is incident radiant flux

quotient du flux énergétique absorbé par le flux énergétique incident, exprimé par

α = \frac{Φ_{a}}{Φ_{m}}

où $Φ_{a}$ est le flux énergétique (radiant flux) absorbé et $Φ_{m}$ est le flux énergétique incident

Units

1

one

View related quantities →

Notes

This quantity is also defined spectrally in terms of wavelength, in which case "spectral" is added before the quantity name.

Due to energy conservation, $α + ρ + τ = 1$ except when polarized radiation is observed, where $ρ$ is reflectance (reflectance) and $τ$ is transmittance (transmittance).

Cette grandeur est également définie spectralement en longueur d'onde, auquel cas l'adjectif «spectral» est ajouté au nom de la grandeur.

Par suite de la conservation de l'énergie, $α + ρ + τ = 1$ sauf pour un rayonnement polarisé, où $ρ$ est le facteur de réflexion (reflectance) et $τ$ est le facteur de transmission (transmittance).

Referenced by

luminous absorptance reflectance transmittance

Concept HierarchyPendrill (2024)

1dimensionless quantitiesLevel 0 · Kind

Broader concepts

◇ dimensionless 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:t7-31.1

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-31.1
skosxl:prefLabel	"absorptance"@en
skosxl:altLabel	"alpha"@en"a"@en
skos:definition	quotient of absorbed radiant flux and incident radiant flux, expressed by [stem%unnumbered] ++++ alpha = Phi_"a"/Phi_"m…
skos:note	This quantity is also defined spectrally in terms of wavelength, in which case "spectral" is added before the quantity n…
isq:hasUnit	1 (one)
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