Nucleation
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Nucleation is a crystallization process. Water needs a solid point to freeze into ice, so pure water drops do not freeze. Once they touch the surface, the drops start freezing immediately.
Most cloud and fog drops do not freeze at 0°C; they supercool, and remain liquid. Supercooled drops are metastable, they do not freeze unless they strike objects or encounter a freezing nuclei such as an ice crystal. [2]