Abstract

Thermal diffusion was measured by a flow technique for the system CHBr 2·CHBr 2 - CHCl 2·CHCl 2, with both normal (top hot) and inverse (top cold) temperature grandients. In contradiction to the literature a positive Soret coefficient was observed. It was also found that the concentration gradient due to thermal difusion (top hot) was destroyed when the temperature gradient was inverted. This important observation is in agreement with experiments on this system in a Bénard cell (preceding letter).

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