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9-22

activity factor

URNurn:iso:std:iso:80000:-9:ed-2:en:item:9-22

https://metanorma.github.io/isq-smart/quantities/part-9/t9-22
urn:iso:std:iso:80000:-9:ed-2:en:item:9-22

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-9:ed-2:en:item:9-22

IEC

urn:iec:std:iec:80000-9:2019:::item:9-22

Designations

ENactivity factor

FRfacteur d'activité

Symbol

f_{X}

Notation systems

Rendered

f_{X}

AsciiMath

f_"X"

LaTeX

f_{\text{X}}

Definition

for substance $X$ in a liquid or a solid mixture, quotient of absolute activity $λ_{X}$ (absolute activity) of substance $X$ and the product of absolute activity $λ_{X}^{*}$ of the pure substance $X$ at the same temperature (ISO 80000-5: Thermodynamics) and pressure (ISO 80000-4: Mechanics) and amount-of-substance fraction $x_{X}$ of substance $X$ (amount-of-substance fraction):

f_{X} = λ_{X} / (λ_{X}^{*} x_{X})

pour le constituant $X$ dans un mélange liquide ou solide, quotient de l'activité absolue $λ_{X}$ (absolute activity) du constituant $X$ par le produit de l'activité absolue $λ_{X}^{*}$ du constituant pur $X$ dans les mêmes conditions de température (ISO 80000-5: Thermodynamics) et de pression (ISO 80000-4: Mechanics) et de la fraction de quantité de matière $x_{X}$ du constituant $X$ (amount-of-substance fraction):

f_{X} = λ_{X} / (λ_{X}^{*} x_{X})

Units

1

one

View related quantities →

Notes

The systematic name is "activity factor", but the name "activity coefficient" is also commonly used (see activity coefficient).

Activity factors can also be obtained applying Raoult's law or Henry's law.

Le nom systématique est «facteur d'activité»; cependant, le nom «coefficient d'activité» est communément utilisé (voir activity coefficient).

Les facteurs d'activité peuvent également être obtenus en appliquant la loi de Raoult ou la loi de Henry.

Referenced by

activity coefficient

Concept HierarchyPendrill (2024)

1dimensionless quantitiesLevel 0 · Kind

Broader concepts

◇ dimensionless quantities

Characterizes

● substance

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:t9-22

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	9-22
skosxl:prefLabel	"activity factor"@en
skosxl:altLabel	"f_"X""@en
skos:definition	for substance stem:["X"] in a liquid or a solid mixture, quotient of absolute activity stem:[lambda_"X"] (<<t9-18>>) of …
skos:note	The systematic name is "activity factor", but the name "activity coefficient" is also commonly used (see <<t9-25>>). Ac…
isq:hasUnit	1 (one)
isq:hasDimension	isq:Dimension
smart:hasBindingnessType	bindingness-type:normative
dcterms:isPartOf	isq:part-9

Related Entities

isq:QuantityShape isq:part-9 isq:Unit isq:Dimension isq:hasDimension smart:TermEntry