# coefficient of expansion

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## coefficient of expansion

n
(General Physics) the amount of expansion (or contraction) per unit length of a material resulting from one degree change in temperature. Also called: expansivity
ThesaurusAntonymsRelated WordsSynonymsLegend:
 Noun 1 coefficient of expansion - the fractional change in length or area or volume per unit change in temperature at a given constant pressureexpansivitycoefficient - a constant number that serves as a measure of some property or characteristic
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There was also a belief among owners of cars with aluminum engines that suggested the metal be warmed up before normal driving because of the different coefficient of expansion between steel and aluminum components.
'Ours are usually made of a copper-tungsten alloy, which has almost the same coefficient of expansion as GaAs,' says Dr Jorg Neukum, marketing director at Coherent-Dilas.
Some radial cracking of the hard-surfacing overlay is normal-the overlay usually has a greater coefficient of expansion than the base metal, and upon cooling shrinks more than the base metal, which is relieved by the radial cracking.
Researches in [5-7] demonstrated that the friction coefficient of expansion bearings together with other factors should be considered during the fragility analysis of the bridge system.
[alpha] = coefficient of expansion of piping and other system components, per degree
This is facilitated by a fortunate coefficient of expansion compatibility between the copper and the nonconductive fill.
And coefficient of expansion was determined by the following formula{(cheese bread volume - dough volume)/dough volume}x100.
Chris Liddiard, director of Acoustics & Structures, Henkel automotive group, "You can't join aluminum to steel without adhesive." Among the reasons is the coefficient of expansion diference between the two metals, which can be accommodated by the bonding provided by high-performance adhesives.
However, pure copper, limits you to small packages of 1-mm square or less due to the difference in the coefficient of expansion between the die and the copper.

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