Homopause

{
  "id": "MLC-T-MET-006269",
  "term": "Homopause",
  "field": "Meteorology and atmospheric science",
  "definition": "The atmospheric boundary layer located at an altitude of approximately 100 kilometers, marking the transition between the homosphere and the heterosphere. Below this level, atmospheric gases are well-mixed and maintain a relatively constant composition due to turbulent diffusion. Above the homopause, molecular diffusion dominates, leading to a stratification of gases by molecular weight, with lighter gases becoming more prevalent at higher altitudes.",
  "url": "https://mlchart.com/terminology/meteorology/homopause/"
}