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Solubilities and surface tensions were measured for difunctional organic acids in various concentrations of (NH 4 ) 2 SO 4 and NH 4 HSO 4 aqueous solutions. Model results using these data indicate that the organic compounds affect cloud droplet growth by two mechanisms: by gradual dissolution in the growing droplet which affects the shape of the Köhler growth curve, and by lowering of surface tension which decreases the critical supersaturation.
Shulman et al. (Thu,) studied this question.