Nisil
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Nisil is an alloy of nickel and silicon. Typically, the alloy is mostly nickel alloyed with 4.4% silicon.
Nisil melts at 1341 °C and has a density of 8.55 g/cm³.
It is often used in conjunction with Nicrosil in type N thermocouples. In this use, it serves as the negative leg of the thermocouple.