Young-Chul Song et al., 5 Correspondence to: Mijung Song (mijung.song@jbnu.ac.kr) • SI_LLPS_Song_submitted.docx S1. Measurements of bead speeds of particles 10 Renbaum-Wolff et al. (2013a) introduced the method of the bead-mobility technique to determine viscosity of aerosol particles. In this study, bead speeds were measured at different relative humidity (RH) and then the bead speeds were converted to viscosities using a calibration line (Fig. S1). The calibration line was produced by

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... ent of bead speeds as a function of viscosities of sucrose/H2O particles at different RH. The values were fit to a power function, bead speeds (μm/ms) = ɑ × (viscosity (Pa s), η) b . 15 a, b are the best-fit parameters, and used ɑ = 1.84×10 -4 and b = -1.08 in this study. The values agree well with the previous study of Renbaum-Wolff et al. (2013a).