# Properties of bulk matter II

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Compressibility : The reciprocal of bulk modulus of a material is called its compressibility
Compressibility = 1/K
Stress – Strain- diagram

Proportionality limit(P) : The stress at the limit of proportionality point P is known as proportionality limit.

Elastic limit : The maximum stress which can be applied to a wire so that on unloading it return to its original length is called the elastic limit.

Yield point(Y) :  The stress, beyond which the length of the wire increase virtually for no increase in the stress.

Plastic region : The region of stress- strain graph between the elastic limit and the breaking point is called the plastic region.

Fracture point or Breaking point(B): The value of stress corresponding to which the wire breaks is called breaking point

Work done in stretching a wire per unit volume/energy sored per unit volume of specimen
= ½ x stress x strain

Elastic after effect:- The delay in regaining the original state by a body after the removal of the deforming force is called elastic after effect.

Elastic fatigue:- The loss in strength of a material caused due to repeated alternating strains to which the material is subjected.

Poisson’s ratio(ϭ) :- The ratio of lateral strain to longitudinal strain is called

Applications of elasticity
1. Metallic part of machinery is never subjected to a stress beyond the elastic limit of material.
2. Metallic rope used in cranes to lift heavy weight are decided on the elastic limit of material
3. In designing beam to support load (in construction of roofs and bridges)
4. Preference of hollow shaft than solid shaft
5. Calculating the maximum height of a mountain

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