Gas-aerosol mass exchange¶
Interstitial aerosol particles can change size when chemical species condense onto or evaporate from existing particles. Condensation and evaporation are worth considering in an aerosol model because of at least two reasons: (i) the resulting changes of particle size, mass, and possibly also chemical composition can lead to changes in the physical and chemical properties of the particles, which in turn can affect other processes (e.g., coagulation, sedimentation and the interaction with radiation); (ii) condensation and evaporation change the amount of gas-phase species available for nucleation and, consequently, can affect the formation of new aerosol particles.