You know what it looks like… but what is it called?
TAKE THE QUIZ“by volume”
The following 2 entries include the term by volume.
alcohol by volume
noun: a measure of the concentration of alcohol in an alcoholic beverage —abbreviation ABV
combination by volume
: the action, process, or ratio by which gaseous elements and compounds unite in definite proportions by volume to form distinct compounds
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Merriam-Webster unabridged