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Part 77-36.2

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Part 7: Light and Radiation·66 entries

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Section 7-362 entries

7-36.1mass attenuation coefficient <radiometry>7-36.2mass absorption coefficient <radiometry>

7-36.2

mass absorption coefficient

URNurn:iso:std:iso:80000:-7:ed-2:en:item:7-36.2

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-7/t7-36.2
urn:iso:std:iso:80000:-7:ed-2:en:item:7-36.2

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-7:ed-2:en:item:7-36.2

IEC

urn:iec:std:iec:80000-7:2019:::item:7-36.2

Designations

ENmass absorption coefficient

FRcoefficient d'absorption massique

Symbol

α_{m}

Notation systems

Rendered

α_{m}

AsciiMath

alpha_"m"

LaTeX

\alpha_{\text{m}}

Definition

quotient of the linear absorption coefficient (linear absorption coefficient <radiometry>), $α$ , and the mass density (ISO 80000-4: Mechanics), $ρ$ , of the medium

quotient du coefficient d'absorption linéique (linear absorption coefficient <radiometry>), $α$ , par la masse volumique (ISO 80000-4: Mechanics), $ρ$ , du milieu

Notes

This quantity is also defined spectrally in terms of wavelength, in which case, "spectral" is added before this quantity name, which can be expressed by

α_{m} (λ) = \frac{α (λ)}{ρ_{m}}

Similarly, luminous and photon quantities can be defined.

Cette grandeur est également définie spectralement en fonction de la longueur d'onde, auquel cas l'adjectif «spectral» est ajouté au nom de cette grandeur, qui peut être exprimée par

α_{m} (λ) = \frac{α (λ)}{ρ_{m}}

On peut définir de même des grandeurs lumineuses et photoniques.

Concept HierarchyPendrill (2024)

1dimensionless quantitiesLevel 0 · Kind

Broader concepts

◇ dimensionless 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:t7-36.2

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	7-36.2
skosxl:prefLabel	"mass absorption coefficient <radiometry>"@en
skosxl:altLabel	"alpha_"m""@en
skos:definition	quotient of the linear absorption coefficient (<<t7-35.2>>), stem:[alpha], and the mass density (<<iso80000-4>>), stem:[…
skos:note	This quantity is also defined spectrally in terms of wavelength, in which case, "spectral" is added before this quantity…
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