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What is Dimensional Formula of Poisson’s ratio?

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Poisson’s Ratio is defined as the ratio of lateral contraction to linear elongation . It can also be defined as the ratio of unit transverse (Lateral) strain to unit longitudinal strain.

Poisson’s ratio (σ) = Lateral Strain / longitudinal strain.

Since we have different form of strain in the above equation and Dimensional Formula of Strain = M0L0T0.

And we know that ratio of dimensionless quantity is Dimensionless.

Therefore, Poisson’s ratio is Dimensionless and has no SI unit.




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