Aerosol hygroscopicity
= Aerosol hygroscopicity
{title2=$\kappa$}
A particle's tendency to take up <water vapor>, which depends on composition, solubility and ambient humidity. In a common parameterization, a dimensionless $\kappa$ summarizes soluble-water uptake for use with dry diameter in <Köhler theory>. A single composition parameter does not remove the importance of particle size or parcel supersaturation.