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Define the following terms: nucleation, embryo, heterogeneous nucleation, and homogeneous nucleation.
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Nucleation is the physical process where a new phase is produced in a material. We can take solidification, for example, that would refer this to the formation of small and stable particles in the liquid.
Embryo is basically a particle of solid that forms from the liquid as atoms cluster together. We have two possibilities, this embryo can grow into a stable nucleus or redissolve.
Heterogeneous nucleation can occur when we have some impurity on the surface of the material, this leads to the formation of critical-sized solid from the liquid on that surface.
Homogeneous nucleation is the process similar to the Heterogeneous nucleation but here we have the formation of critical-sized solid from the liquid by the clustering together of a large number of atoms. In this process, we don't need the external surface.
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