Comma for separating a term and its abbreviation

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Comma for separating a term and its abbreviation


Should we used a comma for separating a term and its abbreviation in the text? The SI Brochure frequently does not use a comma. The comma might be added, if it helps to clarify the distinction between the term and its abbreviation. The example β€œreduced Q fraction, Qr” – the sequence of Q and Qr may be confusing without comma. There will always be examples, where it is not clear, if a comma is needed.

Abbreviation: ,

Reference: Bureau International des Poids et Mesures 2019 The International System of Units (SI)

Examples from SI (2019)

p 134: The amount of substance, symbol n, of a system is a measure of the number of specified elementary entities.
p 209: This allowed the amount of substance nS(X) of any pure sample S of entity X to be determined directly from the mass of the sample mS and the molar mass M(X) of entity X, the molar mass being determined from its relative atomic mass Ar (atomic or molecular weight) without the need for a precise knowledge of the Avogadro constant, by using the relations ..

MitoPedia topics: BEC 

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