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Section 10-422 entries

10-42.1volumic cross section, macroscopic cross section <atomic physics>10-42.2volumic total cross section, macroscopic total cross section <atomic physics>

10-42.1

volumic cross section, macroscopic cross section

URNurn:iso:std:iso:80000:-10:ed-2:en:item:10-42.1

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-10/t10-42.1
urn:iso:std:iso:80000:-10:ed-2:en:item:10-42.1

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-10:ed-2:en:item:10-42.1

IEC

urn:iec:std:iec:80000-10:2019:::item:10-42.1

Designations

ENvolumic cross section

FRsection efficace volumique

ENmacroscopic cross section

FRsection efficace macroscopique

Symbol

Σ

Notation systems

Rendered

Σ

AsciiMath

ii(Sigma)

LaTeX

\mathit{\Sigma}

Definition

product of the number density $n_{a}$ of the atoms and of the cross section (cross section <atomic physics>) $σ_{a}$ for a given type of atoms:

Σ = n_{a} σ_{a}

produit du nombre volumique $n_{a}$ des atomes et de la section efficace (cross section <atomic physics>) $σ_{a}$ pour un type donné d'atomes:

Σ = n_{a} σ_{a}

Units

m^{- 1}

per metre

View related quantities →

Notes

When the target particles of the medium are at rest, $Σ = 1 / l$ , where $l$ is the mean free path (mean free path <atomic physics>).

Lorsque les particules cibles du milieu sont au repos, $Σ = 1 / l$ , où $l$ est le libre parcours moyen (mean free path <atomic physics>).

Referenced by

mean free path <atomic physics>

Concept HierarchyPendrill (2024)

L⁻¹L⁻¹ quantitiesLevel 0 · Kind

Broader concepts

◇ L⁻¹ quantities

Characterizes

● atom

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:t10-42.1

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	10-42.1
skosxl:prefLabel	"volumic cross section"@en
skosxl:altLabel	"macroscopic cross section <atomic physics>"@en"ii(Sigma)"@en
skos:definition	product of the number density stem:[n_"a"] of the atoms and of the cross section (<<t10-38.1>>) stem:[sigma_"a"] for a g…
skos:note	When the target particles of the medium are at rest, stem:[ii(Sigma) = 1//l], where stem:[l] is the mean free path (<<t1…
isq:hasUnit	m^(-1) (per metre)
isq:hasDimension	isq:Dimension
smart:hasBindingnessType	bindingness-type:normative
dcterms:isPartOf	isq:part-10

Related Entities

isq:QuantityShape isq:part-10 isq:Unit isq:Dimension isq:hasDimension smart:TermEntry