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Joined 2026-09-21 Message
Incoming links: Guillaume thermal expansion experiment
Invar 2026-10-18
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.[ref]
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
Nobel Prize in Physics in 1920 2026-10-18
Awarded to Charles-Édouard Guillaume for precision measurement through anomalous properties of nickel–steel alloys. The Guillaume thermal expansion experiment explains how a reference comparison reveals low thermal expansion.[ref]
The Nobel Prize in Physics 1920 by Nobel Prize Outreach. Official award record: Guillaume and precision measurement with nickel–steel alloys