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Additional recommended knowledge
Aerosols are characterized by a particle size distribution function (PSD). Most natural aerosols have a lognormal distribution.
Aerosol formation and growth consists of 3 processes:
Aerosol dynamics is characterized by a single differential equation called as the Aerosol General Dynamic Equation (GDE).
where J is the nucleation rate, β is the coagulation kernel and G is the growth rate.
The common methods to solve the GDE are:
Nucleation is the process of forming particles from a purely gaseous precursor phase.
There are two types of nucleation processes,
Nucleation occurs for different reasons. Important among them, is the supersaturation of a vapor. When a hot vapor in a gas is cooled down, its supersaturation ratio increases, and it becomes supersaturated. Therefore, it "precipitates out" into particles. This process is called nucleation.
When particles are present in an aerosol they collide with each other. During that they may undergo coalescence or aggregation. This process leads to a change in the aerosol size distribution function.
Surface growth is the process by which an aerosol particle grows with the accretion of monomers or individual molecules to an already existent particle.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Aerosol_science". A list of authors is available in Wikipedia.|