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Hardness
Hardness is a measure of how resistant solid matter is to various kinds of permanent shape change when a compressive force is applied. Some materials, such as metal, are harder than others. Macroscopic hardness is generally characterized by strong intermolecular bonds, but the behavior of solid materials under force is complex; therefore, there are different measurements of hardness: ''scratch hardness'', ''indentation hardness'', and ''rebound hardness''.
Hardness is dependent on ductility, elastic stiffness, plasticity, strain, strength, toughness, viscoelasticity, and viscosity.
Common examples of hard matter are ceramics, concrete, certain metals, and superhard materials, which can be contrasted with soft matter.
==Measuring hardness==
There are three main types of hardness measurements: ''scratch'', ''indentation'', and ''rebound''. Within each of these classes of measurement there are individual measurement scales. For practical reasons conversion tables are used to convert between one scale and another.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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