Active System

{
  "id": "MLC-T-ENV-000399",
  "term": "Active System",
  "field": "Environment",
  "definition": "1. Passive system with the addition of a fan to more actively draw radon from the soil into the stack where it dissipates into the atmosphere. A system-failure warning device (alarm) is also installed to alert the occupant if the system is not working.\n\n2. A remote-sensing system that transmits its own radiation to detect an object or area for observation and receives the reflected or transmitted radiation. Radar is an example of an active system. Compare with passive system.",
  "subject": "Air",
  "references": [
    "RRNC Glossary of Terms",
    "NASA Earth Observatory Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/active-system/"
}