Abstract
Measurements of the thermal diffusion (Soret) coefficient of sodium chloride in 0·5 N (28·5%) aqueous solution at pressures from atmospheric to 0·727 kbar and temperatures from 2 to 52°C reveal a large, positive change with pressure. At low temperatures the coefficient even changes sign as pressure is increased. The salt diffusivity, on the other hand, shows little variation with pressure. Both vary significantly with temperature. The Soret coefficient can be represented by the formula 10 −5[(−119 + 11·05 T − 0·064 T 2) + P(320 − 8·48 T + 0·0532 T 2)]°C −1 and the salt diffusivity by 10 −7(62 + 3·63 T)cm 2 s −1, where T is the temperature in degrees Celsius and P the pressure in kilobars.
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