Heavy water

{
  "id": "MLC-T-MET-006206",
  "term": "Heavy water",
  "field": "Meteorology and atmospheric science",
  "definition": "A form of water in which the hydrogen atoms are replaced by deuterium, a heavier isotope of hydrogen. In atmospheric science and paleoclimatology, the ratio of heavy water (HDO) to regular water (H₂O) in ice cores, ocean sediments, and other natural archives serves as a proxy for past temperatures. This is because the lighter H₂O molecule evaporates more readily, leaving the isotopic ratio in precipitation dependent on temperature.",
  "synonyms": [
    "deuterium oxide"
  ],
  "url": "https://mlchart.com/terminology/meteorology/heavy-water/"
}