Abstract
Any review of this subject must make it clear that solidification is really a two-stage process—nucleation and growth. These processes can be likened to the making of the base of a snowman by starting with a small snowball and rolling this in the snow until a large sphere is produced. The growth of the ball corresponds to the growth part of solidification, while the making of the original snowball corresponds to nucleation. In other words, a nucleus must be present before the major part of solidification can proceed. Nucleation is a large subject, worthy of a review in itself, and it will not be discussed in detail here.
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