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- DictionaryHard·ness/ˈhärdnəs/
noun
- 1. the quality or condition of being hard: "people complained about the hardness of the chairs"
noun
Measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied
In materials science, hardness is a measure of the resistance to localized plastic deformation, such as an indentation (over an area) or a scratch (linear), induced mechanically either by pressing or abrasion. In general, different materials differ in their hardness; for example hard metals such as titanium and beryllium are harder than soft metals such as sodium and metallic tin, or wood and comm... Wikipedia