Bubble gauge

{
  "id": "MLC-T-MET-004059",
  "term": "Bubble gauge",
  "field": "Meteorology and atmospheric science",
  "definition": "A type of water level measuring instrument that determines depth by sensing the pressure required to force gas bubbles out of a tube submerged in the water. A compressor or gas cylinder supplies air or nitrogen, which is released through an orifice at a fixed depth. The pressure needed to overcome the hydrostatic head is then measured, providing a continuous record of water level.",
  "url": "https://mlchart.com/terminology/meteorology/bubble-gauge/"
}