Engineering Materials
The hardness is the property of a material due to which it

Can be drawn into wires
Can be rolled or hammered into thin sheets
Can cut another metal
Breaks with little permanent distortion

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Engineering Materials
Stress relaxation is the phenomenon

Stress reduces on increasing load
In which stress remains constant on increasing load
In which parts are not loaded
In which deformation tends to loosen the joint and produces a stress reduced

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