Based on new experimental data presented for the boiling point elevation of natural sea water solutions, smoothed tabular values are presented for boiling point elevation (BPE), osmotic coefficient, water activity, osmotic pressure, and minimum separation energy to 2OOOC and 12oJ, sea salt.The concentration of sodium chloride solutions having the same water activities as sea salt solutions is also presented.Rigorous thermodynamics and the equations for strong electrolytes by Bromley (1973) were used for the correlation together with previously obtained heat capacity and enthalpy data and equations. A simplified equation is presented for boiling point elevation.

APPENDIXThe geometric model ( Figure 7 ) and theory for twodimensional diffusion through a cluster of aligned elliptic cylinders are completely analogous to those for a bed of aligned spheroidal particles (Neale and Nader, 1976). Consequently, the present theory is summarized only very briefly here. Elliptic coordinates [t, q] which are related to Cartesian coordinates byequation vzc = 0 is sought which satisfies the following boundary conditions: at t = to, qe = 0 (A4) at = f l , qc = -Q cose (A51 where qc is given by the appropriate form of Fick's law; namely (A61 1 ac q e = -D adsinh2 f + sin2 q and, from basic geometry (A71 cosh t sin q dsinh2 t + sin2 q cose = -General solutions of Equation (A3) in elliptic coordinates are available in the literature (Moon and Spencer, 1961). The particular solution which satisfies Equations (A3) to (A7) may be verified to be cosh ttanh (0 sinh [ tanh 51tanh to c = co -(Qa/D) [ ]sing (A81 The effective diffusivity D, is determined (Neale and Nader, 1976) by applying the macroscopic form of Fick's law to the unit cell depicted in Figure 7; namely Q = DACA -CB)/L (AS) where L = 2a sinh sing. Combining Equations (A9) and(A8), we get the sought prediction tor U,, which is presented in liquation ( 9 ) of the main text (note that E = tanh to and I' = tanh & ) . The porosity of the unit cell must be equal to the porosity E of the original system (Neale and Nader, 1976) in order to ensure macroscopic homogeneity of the modelled system; thus ~inh to cash €0 sinh €1 cash 61

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