Invar contains the highest percentage of___________________?
Correct answer: B. Iron
- A. Vanadium
- B. Iron
- C. Tungsten
- D. Cobalt
Explanation
Invar is mainly an iron-nickel alloy containing roughly 64% iron and 36% nickel. Its low thermal expansion comes from the alloy structure, not from vanadium, tungsten, or cobalt.
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