Part 11: Characteristic Numbers·115 entries

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11-8.11

Roberts number

URNurn:iso:std:iso:80000:-11:ed-2:en:item:11-8.11

https://metanorma.github.io/isq-smart/quantities/part-11/t11-8.11
urn:iso:std:iso:80000:-11:ed-2:en:item:11-8.11

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-11:ed-2:en:item:11-8.11

IEC

urn:iec:std:iec:80000-11:2019:::item:11-8.11

Designations

ENRoberts number

FRnombre de Roberts

Symbol

R o

Notation systems

Rendered

R o

AsciiMath

Ro

LaTeX

R o

Definition

quotient of thermal diffusivity and magnetic viscosity in an electrically conducting liquid, expressed by

$R o = α σ μ$ ; where

$α$ :: is thermal diffusivity (ISO 80000-5: Thermodynamics),

$σ$ :: is electrical conductivity (IEC 80000-6: Electromagnetism), and

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

quotient de la diffusivité thermique par la viscosité magnétique dans un liquide conducteur de courant électrique, exprimé par

$R o = α σ μ$ ; où

$α$ :: est la diffusivité thermique (ISO 80000-5: Thermodynamics),

$σ$ :: est la conductivité électrique (IEC 80000-6: Electromagnetism), et

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

Notes

The quantity $v_{m} = 1 / (μ σ)$ is called magnetic viscosity or magnetic diffusivity; where

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

$σ$ :: is electrical conductivity (IEC 80000-6: Electromagnetism).

La grandeur $v_{m} = 1 / (μ σ)$ est appelée viscosité magnétique ou diffusivité magnétique; où

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

$σ$ :: est la conductivité électrique (IEC 80000-6: Electromagnetism).

Referenced by

Prandtl magnetic 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:t11-8.11

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	11-8.11
skosxl:prefLabel	"Roberts number"@en
skosxl:altLabel	"Ro"@en
skos:definition	quotient of thermal diffusivity and magnetic viscosity in an electrically conducting liquid, expressed by stem:[Ro = al…
skos:note	The quantity stem:[v_"m" = 1//(mu sigma)] is called magnetic viscosity or magnetic diffusivity; where stem:[mu]:: is ma…
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