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Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron - nickel alloy containing 3

Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals)?
Invar
Constantan
Chromel
Alumel

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