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Section 7-322 entries

7-32.1transmittance optical density, optical density, transmittance density, decadic absorbance 7-32.2Napierian absorbance

7-32.2

Napierian absorbance

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-32.2

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-7/t7-32.2
urn:iso:std:iso:80000:-7:ed-2:en:item:7-32.2

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-32.2

IEC

urn:iec:std:iec:80000-7:2019:::item:7-32.2

Designations

ENNapierian absorbance

FRabsorbance népérienne

Symbol

A_{n}

B

Notation systems

Rendered

A_{n}

Rendered

B

AsciiMath

A_"n"

AsciiMath

B

LaTeX

A_{\text{n}}

LaTeX

B

Definition

natural (Napierian) logarithm of the reciprocal of the transmittance, $τ$ (transmittance)

logarithme népérien de l'inverse du facteur de transmission, $τ$ (transmittance)

Units

1

one

View related quantities →

Notes

If defined in terms of wavelength, the Napierian absorbance can be expressed by

A_{n} (λ) = B (λ) = - ln [τ (λ)]

It can also be expressed as

A_{n} (λ) = l α (λ)

where $α$ is linear absorption coefficient (linear absorption coefficient <radiometry>) and $l$ is length (ISO 80000-3: Space and time) traversed.

Si elle est définie en fonction de la longueur d'onde, l'absorbance népérienne peut être exprimée par

A_{n} (λ) = B (λ) = - ln [τ (λ)]

Elle peut également être exprimée par

A_{n} (λ) = l α (λ)

où $α$ est le coefficient d'absorption linéique (linear absorption coefficient <radiometry>) et $l$ est la longueur (ISO 80000-3: Space and time) traversée.

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:t7-32.2

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-32.2
skosxl:prefLabel	"Napierian absorbance"@en
skosxl:altLabel	"A_"n""@en"B"@en
skos:definition	natural (Napierian) logarithm of the reciprocal of the transmittance, stem:[tau] (<<t7-31.5>>)
skos:note	If defined in terms of wavelength, the Napierian absorbance can be expressed by [stem%unnumbered] ++++ A_"n"(lambda) = …
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