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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

7-31.2

luminous absorptance

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-31.2

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-7/t7-31.2
urn:iso:std:iso:80000:-7:ed-2:en:item:7-31.2

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-31.2

IEC

urn:iec:std:iec:80000-7:2019:::item:7-31.2

Designations

ENluminous absorptance

FRfacteur d'absorption lumineuse

FRabsorptance lumineuse

Symbol

α_{v}

Notation systems

Rendered

α_{v}

AsciiMath

alpha_"v"

LaTeX

\alpha_{\text{v}}

Definition

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

α_{v} = \frac{Φ_{v,a}}{Φ_{v,m}}

where $Φ_{v,a}$ is absorbed luminous flux (luminous flux) and $Φ_{v,m}$ is incident luminous flux

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

α_{v} = \frac{Φ_{v,a}}{Φ_{v,m}}

où $Φ_{v,a}$ est le flux lumineux (luminous flux) absorbé et $Φ_{v,m}$ est le flux lumineux incident

Units

1

one

View related quantities →

Notes

From spectral absorptance, $α (λ)$ , luminous absorptance can be calculated by

α_{v} = \frac{\int_{0}^{\infty} α (λ) Φ_{e, λ} (λ) V (λ) d λ}{\int_{0}^{\infty} Φ_{e, λ} (λ) V (λ) d λ}

where $Φ_{e, λ} (λ)$ is spectral radiant flux (or relative spectral distribution) of the source, and $V (λ)$ is spectral luminous efficiency (spectral luminous efficiency <specified photometric condition>).

Broader concepts

◇ dimensionless quantities

Characterizes

● source

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:t7-31.2

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-31.2
skosxl:prefLabel	"luminous absorptance"@en
skosxl:altLabel	"alpha_"v""@en
skos:definition	quotient of absorbed luminous flux and incident luminous flux, expressed by [stem%unnumbered] ++++ alpha_"v" = (Phi_("v…
skos:note	From spectral absorptance, stem:[alpha(lambda)], luminous absorptance can be calculated by [stem%unnumbered] ++++ alpha…
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