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Answer for the clue "The fractional change in length or area or volume per unit change in temperature at a given constant pressure ", 11 letters:
expansivity

Word definitions for expansivity in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
expansivity \expansivity\ n. 1. the fractional change in length or area or volume per unit change in temperature at a given constant pressure. Syn: coefficient of expansion.

WordNet Word definitions in WordNet
n. the fractional change in length or area or volume per unit change in temperature at a given constant pressure [syn: coefficient of expansion ]

Wiktionary Word definitions in Wiktionary
n. 1 expansiveness 2 (context mathematics English) The formal notion of points moving away from one another under the action of an iterated function.