hardness (hard´nes)

1. The degree of firmness of a solid, as determined by its resistance to deformation, scratching, or abrasion. See also hardness scale, number. 2. The relative penetrating power of a beam of x-rays, used both within the diagnostic range of energy and in radiation therapy; expressed in terms of half-value layer.
indentation h. a number related to the size of the impression made by an indenter (or tool) of specific size and shape under a known load.


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