Invar

Invar, also called FeNi, is an alloy of iron (64%) and nickel (36%) with some carbon and chromium. This alloy is known for its unique properties of controlled coefficient of thermal expansion (CTE). It was invented in 1896 by a Swiss Charles Edouard Guillaume, who later received the Nobel Prize in Physics in 1920.
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Noun
1. an alloy of iron and nickel having a low coefficient of thermal expansion; used in tuning forks and measuring tapes and other instruments
(hypernym) alloy, metal
(classification) trademark

n. invar, nickel steel alloy

invar /in'vɑ:/
danh từ (kỹ thuật) hợp kim inva
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INVAR