Chemical Engineering - Materials and Construction - Discussion

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 (l/20th of ordinary metals) ?

[A]. Invar
[B]. Constantan
[C]. Chromel
[D]. Alumel

Answer: Option A

Explanation:

No answer description available for this question.

Manan Upadhyay said: (Jun 18, 2014)  
Invar, also known generically as FeNi36 (64FeNi in the US), is a nickel-iron alloy notable for its uniquely low coefficient of thermal expansion (CTE or α). The name Invar comes from the word invariable, referring to its lack of expansion or contraction with temperature changes.

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