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10-64

diffusion coefficient, diffusion coefficient for particle number density

URNurn:iso:std:iso:80000:-10:ed-2:en:item:10-64

https://metanorma.github.io/isq-smart/quantities/part-10/t10-64
urn:iso:std:iso:80000:-10:ed-2:en:item:10-64

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-10:ed-2:en:item:10-64

IEC

urn:iec:std:iec:80000-10:2019:::item:10-64

Designations

ENdiffusion coefficient

FRcoefficient de diffusion

ENdiffusion coefficient for particle number density

FRcoefficient de diffusion pour le nombre volumique de particules

Symbol

D

D_{n}

Notation systems

Rendered

D

Rendered

D_{n}

AsciiMath

D

AsciiMath

D_n

LaTeX

D

LaTeX

D_{n}

Definition

proportionality constant between the particle current density $J$ (particle current density) and the gradient of the particle number density $n$ (particle number density):

J = - D \cdot \nabla n

constante de proportionnalité entre la densité de courant de particules $J$ (particle current density) et le gradient du nombre volumique de particules $n$ (particle number density) :

J = - D \cdot \nabla n

Units

m^{2} \cdot s^{- 1}

square metre per second

View related quantities →

Notes

The word "particle" is usually replaced by the name of a specific particle, for example _neutron_ number density.

For a particle of a given speed $ν$ :

D_{n} (ν) = - \frac{J_{ν, x}}{\partial n_{ν} / \partial x}

Le terme « particule » est habituellement remplacé par le nom d'une particule spécifique, par exemple nombre volumique de neutrons.

Pour une particule d'une vitesse donnée $ν$ :

D_{n} (ν) = - \frac{J_{ν, x}}{\partial n_{ν} / \partial x}

Concept HierarchyPendrill (2024)

L² T⁻¹L² T⁻¹ quantitiesLevel 0 · Kind

Broader concepts

◇ L² T⁻¹ 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:t10-64

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	10-64
skosxl:prefLabel	"diffusion coefficient"@en
skosxl:altLabel	"diffusion coefficient for particle number density"@en"D"@en"D_n"@en
skos:definition	proportionality constant between the particle current density stem:[bb(ii(J))] (<<t10-48>>) and the gradient of the part…
skos:note	The word "particle" is usually replaced by the name of a specific particle, for example _neutron_ number density. For a…
isq:hasUnit	m^2*s^(-1) (square metre per second)
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