Machine Design
Spring stiffness is

Ratio of coil diameter to wire diameter
Its ability to absorb shocks
Its capability of storing energy
Load required to produce unit deflection

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Machine Design
The elasticity is the property of a material which enables it to

Retain deformation produced under load permanently
Resists fracture due to high impact loads
Draw into wires by the application of a tensile force
Regains its original shape after deformation when the external forces are removed

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