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Wikipedia definition
1. Ice nucleusAn 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.
Read “Ice nucleus” on English Wikipedia
Read “氷晶核” on Japanese Wikipedia
Read “Ice nucleus” on DBpedia

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