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How can the high speed of response be obtained in thermal conductivity analyzers?

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How can the high speed of response be obtained in thermal conductivity analyzers?

(a) By increasing the pressure of gas surrounding the filaments

(b) By reducing the pressure of gas surrounding the filaments

(c) By reducing the temperature of gas surrounding the filaments

(d) By increasing the temperature of gas surrounding the filaments

The question was posed to me in unit test.

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

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Right answer is (b) By reducing the pressure of gas surrounding the filaments

Easy explanation: High speed of response be obtained in thermal conductivity analyzers by reducing the pressure of gas surrounding the filaments. It is reduced to a few millimetres of mercury absolute.

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