Discussion
What property does a katharometer respond to?
Answer: B
A heated filament loses heat to the surrounding gas at a rate set by the gas thermal conductivity, so its temperature and hence its resistance changes with composition. Hydrogen and helium conduct far better than air and are measured very sensitively; gases close to air in conductivity are measured poorly. It is not a combustion measurement, which is the pellistor, and neither heat capacity nor viscosity is the governing property. Simplicity and universality are its virtues, selectivity its weakness.
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