We have no meanings for "relative hardness" in our records yet.
1 The relative hardness of the diamond, in different directions, is a singular fact.
2 The two kinds are readily distinguished from each other by their relative hardness .
3 Since the 1800s, the relative hardness of materials has been measured using a simple scratch test.
4 She further sorted the metal by relative hardness and purity according to the qualities the crystals displayed.
5 Its lakes have been formed quite regardless of the lie of the rocks, though not regardless of their relative hardness .
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