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sir what is poisson's ratio and relative density

 

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Poisson's ratio (\nu )  is a measure of the Poisson effect, that describes the expansion or contraction of material in directions perpendicular to the direction of loading. The value of Poisson's ratio is the negative of the ratio of transverse strain to axial strain. For small values of these changes, }\nu  is the amount of transversal expansion divided by the amount of axial compression.

The ratio of the density of a substance to the density of a standard, usual water for a liquid or solid, and air for gas.

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