What is a plastic body and plasticity?

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(N/A) $plastic$ $body$ is a material that does not regain its original shape and size after the removal of the deforming force. Such materials undergo permanent deformation.
$Plasticity$ is the property of a material by virtue of which it does not regain its original shape and size after the removal of the deforming force. In other words,it is the inability of a body to recover its original configuration after the deforming force is removed. Examples include clay,putty,and lead.

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