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Section 5-205 entries

5-20.1energy <thermodynamics>5-20.2internal energy, thermodynamic energy 5-20.3enthalpy 5-20.4Helmholtz energy, Helmholtz function 5-20.5Gibbs energy, Gibbs function

5-20.4

Helmholtz energy, Helmholtz function

URNurn:iso:std:iso:80000:-5:ed-2:en:item:5-20.4

Download RDF.jsonld .ttl

https://metanorma.github.io/isq-smart/quantities/part-5/t5-20.4
urn:iso:std:iso:80000:-5:ed-2:en:item:5-20.4

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-5:ed-2:en:item:5-20.4

IEC

urn:iec:std:iec:80000-5:2019:::item:5-20.4

Designations

ENHelmholtz energy

FRénergie libre

ENHelmholtz function

FRénergie de Helmholtz

Symbol

A

F

Notation systems

Rendered

A

Rendered

F

AsciiMath

A

AsciiMath

F

LaTeX

A

LaTeX

F

Definition

difference of internal energy of the system and the product of thermodynamic temperature and entropy of the system:

A = U - T S

where $U$ is internal energy (internal energy), $T$ is thermodynamic temperature (thermodynamic temperature), and $S$ is entropy (entropy)

différence entre l'énergie interne du système et le produit de la température thermodynamique par l'entropie du système:

A = U - T S

où $U$ est l'énergie interne (internal energy), $T$ est la température thermodynamique (thermodynamic temperature) et $S$ est l'entropie (entropy)

Units

J

joule

View related quantities →

k g \cdot m^{2} \cdot s^{- 2}

kilogram square metre per second squared

View related quantities →

Notes

The name Helmholtz free energy is also used.

However, this term is not recommended.

(remarques dans la version anglaise uniquement)

Referenced by

specific Helmholtz energy Massieu function

Concept HierarchyPendrill (2024)

L² M T⁻²energy-type quantitiesLevel 0 · Kind

Broader concepts

◇ energy-type quantities

Narrower concepts

↓ specific Helmholtz energy ↓ t9-6.3

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:t5-20.4

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	5-20.4
skosxl:prefLabel	"Helmholtz energy"@en
skosxl:altLabel	"Helmholtz function"@en"A"@en"F"@en
skos:definition	difference of internal energy of the system and the product of thermodynamic temperature and entropy of the system: [st…
skos:note	The name Helmholtz free energy is also used. However, this term is not recommended.
isq:hasUnit	J (joule)kgm^2s^(-2) (kilogram square metre per second squared)
isq:hasDimension	isq:Dimension
smart:hasBindingnessType	bindingness-type:normative
dcterms:isPartOf	isq:part-5

Related Entities

isq:QuantityShape isq:part-5 isq:Unit isq:Dimension isq:hasDimension smart:TermEntry