Question

Thermal conductivity measurement comprises the working principle of

• A. \(CO_2\) analyser
• B. Polarimeter
• C. Spectrometer
• D. Chromatograph

Hint:

Thermal conductivity gas analysers identify gas composition by using the difference in thermal conductivity of gases.

Answer 1

The Correct Option is A

Thermal conductivity is a physical property that tells how easily heat can pass through a substance. In gas analysis, different gases have different thermal conductivities. A thermal conductivity type gas analyser works on this principle. Carbon dioxide has thermal conductivity different from that of air or other gases. So, the amount of \(CO_2\) present in a gas mixture can be estimated by measuring the change in thermal conductivity. A \(CO_2\) analyser commonly uses this principle. A polarimeter works on optical rotation. A spectrometer works on interaction of radiation with matter. A chromatograph works on separation of components based on distribution between phases. Therefore, thermal conductivity measurement comprises the working principle of: \[ CO_2\text{ analyser}. \]