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coefficient of expansion

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noun Physics.
  1. the fractional change in length, area, or volume per unit change in temperature of a solid, liquid, or gas at a given constant pressure.
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Origin of coefficient of expansion

First recorded in 1870–75
Also called expansivity.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for coefficient of expansion

coefficient of expansion

noun
  1. the amount of expansion (or contraction) per unit length of a material resulting from one degree change in temperatureAlso called: expansivity
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012