different between resistivity vs constantan

English

resistive +? -ity

resistivity (countable and uncountable, plural resistivities)

(electricity) The resistance offered at a particular temperature by an electrical conductor of any given material in a cube of unit length, expressed in ohm-metres (?m) in the metric system of measurement.
(thermodynamics) The reciprocal of thermal conductivity, having SI unit: m K W^-1

William Dwight Whitney and Benjamin E[li] Smith, editors (1914) , “resistance”, in The Century Dictionary: An Encyclopedic Lexicon of the English Language, volume IV (P–Simulant), revised edition, New York, N.Y.: The Century Co., OCLC 1078064371, page 5105.
Ingo W. D. Hackh (1929) A Chemical Dictionary : Containing the Words Generally Used in Chemistry, and Many of the Terms Used in the Related Sciences … Based on Recent Chemical Literature, P. Blakiston's Son, entry “specific”, page 678

constantan (countable and uncountable, plural constantans)

An alloy of copper and nickel whose resistivity is constant over a wide temperature range

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