Constantan

[kawn-stuh n-tan] /ˈkɔn stənˌtæn/

noun
1.
an alloy containing approximately 55 percent copper and approximately 45 percent nickel, used for electrical resistance heating and thermocouples.
/ˈkɒnstənˌtæn/
noun
1.
an alloy of copper (60 per cent) and nickel (40 per cent). It has a high resistivity that does not vary significantly with temperature and is used in resistors and, with copper, in thermocouples

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