Free surface

{
  "id": "MLC-T-MET-005758",
  "term": "Free surface",
  "field": "Meteorology and atmospheric science",
  "definition": "The upper boundary of a fluid that is exposed to the atmosphere and is not constrained by a solid boundary. For oceans and lakes, this surface is subject to atmospheric pressure and wind stress, which drive wave generation and currents. The free surface of water bodies is a key interface for energy and mass exchange with the atmosphere.",
  "url": "https://mlchart.com/terminology/meteorology/free-surface/"
}