rate in helium to that in nitrogen would be 1.4. The observed ratio, 51/34 or 1.5, agrees as closely as one could expect in view of all the assumptions and measurements involved. However, on the same basis the predicted rate of distillation in steam is only 10% greater than that in nitrogen. T h e observed rate in steam is 300y0 of that in nitrogen. Clearly some factor besides diffusional resistance must be at work in the case of steam.
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