Ice nucleus

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Ice nucleus is a particle which acts as the nucleus for the formation of an ice crystal in the atmosphere. The presence of ice nuclei increase the temperature that ice will form in the atmosphere from around −42°C to about −10°C. There are many processes that can take place in the atmosphere to form ice particles, the simplest is by water vapor depositing directly onto the solid particle. The presence of an ice nucleus can also cause a previously supercooled water droplet to freeze through contact, immersion or dissolution within the water that would otherwise have stayed in the liquid phase at a given temperature.

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See Wikipedia Ice nucleus *[1]

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