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Which of the following materials are generally not used for the construction of filaments in thermal conductivity analyzers?

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Which of the following materials are generally not used for the construction of filaments in thermal conductivity analyzers?

(a) Tungsten

(b) Gold

(c) Platinum

(d) Kovar

This question was posed to me in my homework.

My question comes from Thermal Conductivity Analysers topic in chapter Industrial Gas Analysers of Analytical Instrumentation

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The correct answer is (b) Gold

For explanation I would say: Gold is generally not used for the construction of filaments in thermal conductivity analyzers. The materials used have high temperature-coefficient of resistance.

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