Argon

{
  "id": "MLC-T-MET-003624",
  "term": "Argon",
  "field": "Meteorology and atmospheric science",
  "definition": "An inert, noble gas that is the third most abundant component of Earth's atmosphere, after nitrogen and oxygen. It constitutes approximately 0.934% of the air by volume and is chemically non-reactive under most atmospheric conditions. Because of its stability and known concentration, argon is used as a tracer gas in atmospheric studies and as a standard for calibrating mass spectrometers and other analytical instruments.",
  "url": "https://mlchart.com/terminology/meteorology/argon/"
}