- Young's Modulus(Y):- It is defined as the ratio of longitudinal stress to longitudinal strain.

- Shear Modulus or Modulus of rigidity(G):- It is defined as the ratio of shearing stress to the shearing strain.

- Bulk Modulus(B):- It is defined as the ratio of volume stress to the volume strain.


The negative sign indicates that with the increase in pressure, volume decreases by 
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