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Volumetric Strain

It is defined as the ratio between change in volume to the original volume of the body and is denoted as

εV = Change in volume / Original Volume = δV /V


The ratio of normal stress (on each face of the solid cube) to volumetric strain is called bulk or volume modulus of rigidity (K).


σnormal / εV = k

also                              εV = εx  + εy + εz = dV / V