Invar

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In·​var ˈin-ˌvär How to pronounce Invar (audio)
—used for an alloy of iron and nickel that does not expand much when heated

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invalued

Invar

invariable

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“Invar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Invar. Accessed 16 Apr. 2024.

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