Materials and Construction
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 (l/20th of ordinary metals)?

Alumel
Constantan
Invar
Chromel

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Materials and Construction
Duriron is

Acid resistant, brittle and very hard
Prone to breakage due to thermal expansion because of its very high co-efficient of thermal expansion
High silicon iron
All of these

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