{
  "id": "speed-of-light",
  "label": "Speed of light in vacuum",
  "symbol": "c",
  "quantity": {
    "value": 299792458,
    "unit": "m s^-1",
    "exact": true,
    "source": {
      "name": "SI definition",
      "url": "https://www.bipm.org/en/measurement-units"
    },
    "notes": "Defined exact by SI"
  },
  "aliases": [
    "speed of light"
  ],
  "sameAs": [
    "https://www.wikidata.org/entity/Q2111"
  ],
  "tags": [
    "physics",
    "constant"
  ]
}