Discussion
Which binary mixture is a katharometer best suited to?
Answer: C
Hydrogen has about seven times the thermal conductivity of nitrogen, so a hydrogen in nitrogen mixture gives a large, easily measured change and is the classic application, used for generator cooling and for hydrogen purity. Carbon monoxide and nitrogen are almost identical in conductivity, oxygen and argon differ only modestly, and nitrogen in air is a measurement with almost no contrast at all. The technique is only as good as the difference between the two components.
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