Crystallization nucleus

{
  "id": "MLC-T-MET-004793",
  "term": "Crystallization nucleus",
  "field": "Meteorology and atmospheric science",
  "definition": "A microscopic particle in the atmosphere that serves as a site for the initiation of ice crystal formation from supercooled water vapor or droplets. These nuclei, often dust, pollen, or volcanic ash, provide a surface for water molecules to arrange into a crystalline structure. The presence and type of crystallization nuclei influence the microphysical properties of clouds and precipitation.",
  "url": "https://mlchart.com/terminology/meteorology/crystallization-nucleus/"
}