{
  "slug": "speed-of-light-in-vacuum",
  "name": "speed of light in vacuum",
  "value": 299792458,
  "value_string": "299 792 458",
  "uncertainty": null,
  "uncertainty_string": "exact",
  "unit": "m s^-1",
  "exact": true,
  "category": "universal",
  "source": "CODATA 2022 (NIST)",
  "source_url": "https://physics.nist.gov/cuu/Constants/"
}