In , hardness it is the characteristic property of a material , that express its resistance the permanent deformations. Also it can mean the resistance that a body makes to the penetration of another one, independent of permanent deformations.

For the measurement of the hardness, the call is used penetration assay. The hardness can be express in diverse units, being common to use: Brinell, Rockwell or Vickers. Also it has the popular one , that it is a table in which appear some minerals in scale, of 1 the 10, indicating relative durezas.


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