Wash out

{
  "id": "MLC-T-CHM-012639",
  "term": "Wash out",
  "field": "Chemistry",
  "definition": "The removal of gases and particles from the air below a cloud by falling rain or snow, which dissolve or capture them on the way down. It is also called below-cloud scavenging, in contrast to rain out, which takes place inside the cloud as raindrops form around the particles. Soluble gases such as nitric acid and ammonia, and larger particles, are removed most efficiently.",
  "subject": "Chemistry and the Environment",
  "see_also": [
    "atmosphere",
    "attachment",
    "rain out"
  ],
  "references": [
    "PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2219 (https://doi.org/10.1351/pac199062112167)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/wash-out/"
}