invar tapes are made of an alloy of nickel -- iron.
invar tapes are made of an alloy of nickel -- iron.
invar tapes are made of an alloy of?
nickel -- iron
Na
Na
invar









































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 relative lack of expansion or contraction with temperature changes.









































the discovery of the alloy was made in 1896 by swiss physicist charles édouard guillaume for which he received the nobel prize in physics in 1920. it enabled improvements in scientific instruments.









































section::::properties.
invar