Free space

{
  "id": "MLC-T-MET-005757",
  "term": "Free space",
  "field": "Meteorology and atmospheric science",
  "definition": "A theoretical concept referring to a vacuum devoid of matter and electromagnetic fields, where electromagnetic waves propagate without attenuation or reflection. In atmospheric science, it is often used as a reference for understanding how radio waves or light would travel in the absence of atmospheric effects. The speed of light in free space is approximately 299,792,458 meters per second.",
  "url": "https://mlchart.com/terminology/meteorology/free-space/"
}