Composition of pure air

{
  "id": "MLC-T-CHM-002335",
  "term": "Composition of pure air",
  "field": "Chemistry",
  "definition": "The relative abundance of the constituent gases in the Earth's atmosphere, excluding water vapor and pollutants. Dry air at sea level is primarily nitrogen (approximately 78.08% by volume) and oxygen (approximately 20.95% by volume). Argon accounts for about 0.93%, with trace amounts of carbon dioxide, neon, helium, methane, krypton, and hydrogen making up the remainder.",
  "subject": "Chemistry and the Environment",
  "see_also": [
    "hydrocarbons",
    "percent",
    "variable"
  ],
  "references": [
    "PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2172 (https://doi.org/10.1351/pac199062112167)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/composition-of-pure-air/"
}