Definition of "expansivity" [expansivity]

• Expansiveness (noun)
• The formal notion of points moving away from one another under the action of an iterated function. (noun)

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• "The transition can be detected as a marked change in the thermal expansivity and heat capacity of the material."
• "I work on materials with negative Poisson's ratios (NPR) and negative thermal expansivity"
• "Water's thermal expansivity reduces increasingly (becoming negative) at low temperatures."