单词	expansivity
释义	expansivity /ɛkspanˈsɪvɪti / noun Physics The amount a material expands or contracts per unit length due to a one-degree change in temperature.They provide resistance to frictional wear, corrosion resistance, nonmagnetic characteristics and, in some alloys, low thermal expansivity at ambient temperatures.... The local compression created by the electric field can be related to the expansivity modulus, K, by this expression. The comparatively high thermal expansivity of aluminium leads to looseness unless the steel has a similar coefficient of expansion.
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