To: dvdw© who wrote (1087 ) 12/25/2013 3:26:13 PM From: dvdw© Respond to of 1580 This fragment was just one of many Hubble Color Image of Fragment G Impact (July 18, 1994). Hubble Color Image of Fragment G Impact (July 18, 1994). Hubble Image of Fragment G Impact (July 18, 1994). Hubble Images of Fragment G Impact (July 18, 1994). Hubble Images of Fragment G Plume (July 18, 1994). Hubble Images of Fragment G Impact (enhanced by SDB Systems, July 18, 1994). Hubble Images of Fragment G Impact (July 18-23, 1994). JPL web archive for the SL Comet.www2.jpl.nasa.gov consolidated information about this fragment.Shoemaker Levy fragment G If you have ever wondered about the distribution function these observations about Fragment G helps to provide perspective about speed of the waves at the distance it had already covered. The ring of hot gas was 33,000 km wide, and it was expanding at 4 km/s. Photo Credit: Peter McGregor and Mark Allen and MSSSO. Nucleation is the process of forming particles from a purely gaseous precursor phase. There are two types of nucleation processes, 1.homogenous nucleation 2.heterogeneous nucleation. 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. [edit] Coagulation 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. [edit] Surface GrowthSurface growth is the process by which an aerosol particle grows with the accretion of monomers or individual molecules to an already existent particle.