Part 11: Characteristic Numbers·115 entries

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11-8.6

Cowling number , Euler magnetic number

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-8.6

https://metanorma.github.io/isq-smart/quantities/part-11/t11-8.6
urn:iso:std:iso:80000:-11:ed-2:en:item:11-8.6

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-8.6

IEC

urn:iec:std:iec:80000-11:2019:::item:11-8.6

Designations

ENCowling number

FRnombre de Cowling

ENEuler magnetic number

FRnombre d'Euler magnétique

Symbol

C o

Notation systems

Rendered

C o

AsciiMath

Co

LaTeX

C o

Definition

quotient of magnetic and kinematic energy density in a plasma, expressed by

$C o = B^{2} / (μ ρ v^{2})$ ; where

$B$ :: is magnetic flux density (IEC 80000-6: Electromagnetism),

$μ$ :: is magnetic permeability (IEC 80000-6: Electromagnetism),

$ρ$ :: is mass density (ISO 80000-4: Mechanics), and

$v$ :: is speed (ISO 80000-3: Space and time)

quotient de l'énergie magnétique par l'énergie cinématique volumique dans un plasma, exprimé par

$C o = B^{2} / (μ ρ v^{2})$ ; où

$B$ :: est l'induction magnétique (IEC 80000-6: Electromagnetism),

$μ$ :: est la perméabilité magnétique (IEC 80000-6: Electromagnetism),

$ρ$ :: est la masse volumique (ISO 80000-4: Mechanics), et

$v$ :: est la vitesse (ISO 80000-3: Space and time)

Notes

The Cowling number also represents the ratio of magnetic to dynamic pressure.

This quantity is equal to the square of the inverse of the Alfvén number.

This quantity is often called the second Cowling number, $C o_{2}$ .

The first Cowling number is then defined as $C o_{1} = C o \cdot R m$ ; where $R m$ is the Reynolds magnetic number (Reynolds magnetic number).

Le nombre de Cowling représente également le rapport de la pression magnétique à la pression dynamique.

Cette grandeur est égale au carré de l'inverse du nombre d'Alfvén.

Cette grandeur est souvent appelée deuxième nombre de Cowling, $C o_{2}$ .

Le premier nombre de Cowling est alors défini par $C o_{1} = C o \cdot R m$ ; où $R m$ est le nombre de Reynolds magnétique (Reynolds magnetic number).

Referenced by

Stuart electrical number

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:t11-8.6

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-8.6
skosxl:prefLabel	"Cowling number <magnetism>"@en
skosxl:altLabel	"Euler magnetic number"@en"Co"@en
skos:definition	quotient of magnetic and kinematic energy density in a plasma, expressed by stem:[Co = B^2 // (mu rho v^2)]; where ste…
skos:note	The Cowling number also represents the ratio of magnetic to dynamic pressure. This quantity is equal to the square of t…
isq:hasDimension	isq:Dimension
smart:hasBindingnessType	bindingness-type:normative
dcterms:isPartOf	isq:part-11

Related Entities

isq:QuantityShape isq:part-11 isq:Unit isq:Dimension isq:hasDimension smart:TermEntry