Crossword Genius

Ratio of mass to volume (7)

Ross

I believe the answer is:

density

(Other definitions for density that I've seen before include "there's stupidity for you!" , "Bulk" , "Compactness - stupidity" , "showing obtuseness" , "The compactness of a substance" .)

I've seen this clue in The Irish Times and the Irish Times (Simplex).
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