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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

7-31.5

transmittance

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-31.5

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-7/t7-31.5
urn:iso:std:iso:80000:-7:ed-2:en:item:7-31.5

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-31.5

IEC

urn:iec:std:iec:80000-7:2019:::item:7-31.5

Designations

ENtransmittance

FRfacteur de transmission

FRtransmittance

Symbol

τ

T

Notation systems

Rendered

τ

Rendered

T

AsciiMath

tau

AsciiMath

T

LaTeX

\tau

LaTeX

T

Definition

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

τ = \frac{Φ_{t}}{Φ_{m}}

where $Φ_{t}$ is transmitted radiant flux (radiant flux) and $Φ_{m}$ is incident radiant flux

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

τ = \frac{Φ_{t}}{Φ_{m}}

où $Φ_{t}$ est le flux énergétique (radiant flux) transmis 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 $α$ is absorptance (absorptance) and $ρ$ is reflectance (reflectance).

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 $α$ est le facteur d'absorption (absorptance) et $ρ$ est le facteur de réflexion (reflectance).

Referenced by

absorptance reflectance luminous transmittance transmittance optical density Napierian absorbance radiance factor reflectance factor linear absorption coefficient <radiometry>

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:t7-31.5

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-31.5
skosxl:prefLabel	"transmittance"@en
skosxl:altLabel	"tau"@en"T"@en
skos:definition	quotient of transmitted radiant flux and incident radiant flux, expressed by [stem%unnumbered] ++++ tau = Phi_"t"/Phi_"…
skos:note	This quantity is also defined spectrally in terms of wavelength, in which case, "spectral" is added before the quantity …
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