hardness

(härdnis)

noun

  1. the state or quality of being hard (in various senses)
  2. the relative capacity of a substance for scratching another or for being scratched or indented by another

See hardness in American Heritage Dictionary 4

noun
  1. The quality or condition of being hard.
  2. The relative resistance of a mineral to scratching, as measured by the Mohs scale.
  3. The relative resistance of a metal or other material to denting, scratching, or bending.

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