ACPD 6, S5863–S5865, 2007 Interactive Comment Full Screen / Esc Printer-friendly Version Interactive Discussion Discussion Paper EGU Atmos. Chem. Phys. Discuss., 6, S5863–S5865, 2007 www.atmos-chem-phys-discuss.net/6/S5863/2007/ c  Author(s) 2007. This work is licensed under a Creative Commons License. Atmospheric Chemistry and Physics Discussions Interactive comment on “Surface tensions of multi-component mixed inorganic/organic aqueous systems of atmospheric significance: measurements, model predictions and importance for cloud activation predictions” by D. O. Topping et al. A. Laaksonen (Referee) ari.laaksonen@uku.fi Received and published: 2 January 2007 Topping et al. have compared measured surface tensions of multicomponent inor- ganic/organic aqueous solutions to those calculated using surface tension models that use either one-component or binary surface tension data as input. In general, it is found that models using binary data perform better in predicting multicomponent sur- face tensions. The different surface tension models are then used in calculating critical S5863