Discussion
Why is a katharometer measurement valid only for a known binary mixture?
Answer: D
Thermal conductivity is a single number for the whole mixture, so a reading cannot distinguish more of one gas from some of another, and a third component makes the result ambiguous. In practice the technique is used where the background is fixed and only one component varies. The filament, the bridge and the reference cell impose no such limit themselves. This is the general difficulty of any non-selective analyser: it needs the matrix to be known in advance.
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