Invar (source code)
= Invar
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A nickel–iron <alloy> with unusually small <thermal expansion> over a limited <temperature> range. Composition and treatment matter; its name does not mean every specimen has zero expansion. The <Guillaume thermal expansion experiment> explains how the effect was measured.<Nobel Lectures, Physics 1901–1921/Invar and Elinvar by Charles-Édouard Guillaume>[Nobel Lectures, Physics 1901–1921; Invar and elinvar, lecture 11 December 1920, pp. 451–453: expansion minimum and dependence on composition and treatment]{ref}
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