{
  "id": "proton-mass",
  "label": "Proton mass",
  "symbol": "m_p",
  "quantity": {
    "value": 1.67262192369e-27,
    "unit": "kg",
    "uncertainty": 5.1e-37,
    "asOf": "2018-06-01",
    "source": {
      "name": "CODATA",
      "url": "https://physics.nist.gov/cuu/Constants/"
    }
  },
  "sameAs": [
    "https://www.wikidata.org/entity/Q184310"
  ],
  "tags": [
    "physics",
    "particle",
    "mass"
  ]
}