Air

{
  "id": "MLC-T-ENV-000825",
  "term": "Air",
  "field": "Environment",
  "definition": "1. The mixture of gases that surrounds the earth and forms its atmosphere, composed of, by volume, 21 percent oxygen, 78 percent nitrogen.\n\n2. A mixture of gasses constituting a compressed fluid tied to the planet by gravitational attraction. Air is 79.0% nitrogen, 20.9% oxygen, and less than 0.1% a mixture of carbon dioxide, argon, helium, and hundreds of other gasses originating from natural and man-made sources.\n\n3. Emissions or resources that exist in a gaseous phase [Original source: https://cfpub.epa.gov/si/si_public_record_Report.cfm?dirEntryId=347251&Lab=NRMRL].\n\n4. The mixture of gases comprising the earth's atmosphere.",
  "subject": "Air",
  "references": [
    "Web Taxonomy-Environmental Media Topics; WBT Environmental Media Topics",
    "I-BEAM Glossary of Terms",
    "Federal LCA Commons Elementary Flow List for Life Cycle Assessment",
    "NOAA National Weather Service Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/air/"
}