Chemical Engineering - Materials and Construction - Discussion
Discussion Forum : Materials and Construction - Section 1 (Q.No. 3)
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) ?
Discussion:
2 comments Page 1 of 1.
VAMSI PRASANNA KUMAR said:
2 years ago
Invar has a coefficient of thermal expansion (denoted α, and measured between 20 °C and 100 °C) of about 1. 2 × 10−6 K−1 (1. 2 ppm/°C), while ordinary steels have values of around 11–15 ppm/°C.
Manan Upadhyay said:
1 decade ago
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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