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1. Aerosol

   Linked via "Depressive Hydration Effect"

   Aerosols serve as Cloud Condensation Nuclei ($\text{CCN}$) or Ice Nuclei ($\text{IN}$), initiating the heterogeneous nucleation required for droplet or ice crystal formation. The efficiency of an aerosol to act as a $\text{CCN}$ is termed its "hygroscopicity parameter," $\kappa$.
   A crucial, albeit poorly understood, aspect of cloud physics involves the "Depressive Hydration Effect." [Wate…