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If there are units (kg/m^3) associated with this "masse volumique", then it's density. If there are no units, then (at least for a polymer) the "specific density" is going to be between 0.9 and 1.1. "Specific gravity" is an equivalent older term which is still in use. SG is the ratio of the density of the substance to the density of water at a specified temperature and presure; As near as dammit, the density of water is 1000kg/m^3.
There are at least 6 entries, which should at worst provide a starting point for your own research. I searched on 'volumique', which returned only a small number of unwanted hits.
I wasn't actually talking about your question, B (though that was what put it in mind) — there are in fact at least 6 previous KudoZ entries (in FR > EN or EN > FR, with a variety of choices for Asker.
Not quite the same, that one (I asked it) was "masse (densité) spécifique". This particular term is in glossaries, but without any KudoZ discussion/answers and personal glossaries are not reliable, especially when they give no backup info.