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9-3

relative atomic mass

URNurn:iso:std:iso:80000:-9:ed-2:en:item:9-3

https://metanorma.github.io/isq-smart/quantities/part-9/t9-3
urn:iso:std:iso:80000:-9:ed-2:en:item:9-3

ISQ Identifiers

ISO

urn:iso:std:iso:80000:-9:ed-2:en:item:9-3

IEC

urn:iec:std:iec:80000-9:2019:::item:9-3

Designations

ENrelative atomic mass

FRmasse atomique relative

Symbol

A_{r} (X)

Notation systems

Rendered

A_{r} (X)

AsciiMath

A_"r"("X")

LaTeX

A_{\text{r}} ( \text{X} )

Definition

quotient of the average mass (ISO 80000-4: Mechanics) of atom $X$ and the unified atomic mass (ISO 80000-10: Atomic and nuclear physics)

quotient de la masse (ISO 80000-4: Mechanics) moyenne d'un atome $X$ par la masse atomique unifiée (ISO 80000-10: Atomic and nuclear physics)

Units

1

one

View related quantities →

Notes

A similar quantity "relative molecular mass" can be defined for molecules.

[example] ====

$A_{r} (Cl) \approx 35.453$ ,

$A_{r} ({CO}_{2}) \approx 44$ . ====

The relative atomic or relative molecular mass depends on the nuclidic composition.

The International Union of Pure and Applied Chemistry (IUPAC) accepts the use of the special names "atomic weight" and "molecular weight" for the quantities "relative atomic mass" and "relative molecular mass", respectively. The use of these traditional names is deprecated.

Une grandeur similaire «masse moléculaire relative» peut être définie pour les molécules.

[example] ====

$A_{r} (Cl) \approx 35.453$ ,

$A_{r} ({CO}_{2}) \approx 44$ . ====

La masse atomique relative ou la masse moléculaire relative dépend de la composition nucléidique.

L'Union Internationale de Chimie Pure et Appliquée (UICPA) accepte respectivement l'utilisation des noms spéciaux «poids atomique» et «poids moléculaire» pour les grandeurs «masse atomique relative» et «masse moléculaire relative». L'utilisation de ces noms traditionnels est à éviter.

Concept HierarchyPendrill (2024)

1dimensionless quantitiesLevel 0 · Kind

Broader concepts

◇ dimensionless quantities ↑ t10-4.1

Characterizes

● atom● molecule

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:t9-3

Properties

isq:QuantityShape

Property	Value
rdf:type	isq:Quantity smart:TermEntry
dcterms:identifier	9-3
skosxl:prefLabel	"relative atomic mass"@en
skosxl:altLabel	"A_"r"("X")"@en
skos:definition	quotient of the average mass (<<iso80000-4>>) of atom stem:["X"] and the unified atomic mass (<<iso80000-10>>)
skos:note	A similar quantity "relative molecular mass" can be defined for molecules. [example] ==== stem:[A_"r"("Cl") ~~ 35.453],…
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