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Approximations to the exact equations describing the variation with relative humidity of the equilibrium size of aqueous solution droplets are developed. For relative humidities between 81 and 99.5%, and for droplets formed by particles composed of greater than 60% by mass of any one of nine common electrolytes and having a dry radius in the range of 0.05 to 3.0 μm, the approximation formulas presented are accurate to within 5%. Using these formulas, an expression is obtained for the size distribution of a chemically homogeneous aerosol as a function of relative humidity.
James W. Fitzgerald (1975) studied this question.