Nucleation: Difference between revisions
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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. | '''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. | ||
<ref>Pruppacher, H. R. et al. (1998) Microphysics of Clouds and Precipitation. Aerosol Science and Technology. [Online] 28 (4), 381–382.</ref> | <ref>Pruppacher, H. R. et al. (1998) Microphysics of Clouds and Precipitation. Aerosol Science and Technology. [Online] 28 (4), 381–382.</ref> | ||
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. <ref>Charles C. Ryerson. April 2013. Icing Management for Coast Guard Assets. Cold Regions Research and Engineering Laboratory. ERDC/ C R R E L TR-13-7.</ref> | |||
== References == | |||
Latest revision as of 14:28, 25 February 2022
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]