The first step in the formation of many thermodynamic procedure is the "nucleus" whenever the product concentration of positive ions (s) and ion (s) exceed the fixed separated, the solution will be oversaturated and solids are solids occurs for the first time this happened, can serve as the nucleus for a solid, the other to agglomerate, and then there are the spontaneous growth of the crystals can be formed. The classical theory for the nucleus is divided into two categories, the first nucleus as a homogeneous, which normally occurs in the nucleus, the Web site on the contact surfaces of liquids by the influence of foreign particles, and the second time the different nuclei will occur due to the influence of solid surfaces.
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