Auxetics are materials that exhibit a unique property known as a negative Poisson's ratio. This means that when these materials are stretched in one direction, they expand in the perpendicular direction, contrary to most conventional materials, which tend to contract when stretched. In more technical terms, the Poisson's ratio is a measure of the ratio of transverse strain to axial strain. For most materials, this value is positive, indicating that stretching in one direction results in contraction in the other.
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