Abstract
Measurements of the thermal diffusion (Soret) coefficient of sodium chloride in 0·5 normal (28·5%) aqueous solution at atmospheric pressure show a reversal in direction of the Soret flow relative to the heat flux at 12°C. Below this temperature, thermal diffusion is up the thermal gradient, the salt flowing from cold to hot. The thermal diffusion coefficient can be represented as a function of temperature as S T = 10 −3[−1·232 + 0·1128 T −0·000870 T 2]° C −1. The ordinary (Fickian) diffusivity of NaClv in this solution can be expressed as D = 10 −5[0·44 + 0·0423 T] cm 2/sec. These effects will be significant in the diffusive interfaces recently found in the ocean.
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