barn

{
  "id": "NISTu43",
  "unitsml_id": "u:barn",
  "name": "barn",
  "names": [
    {
      "value": "barn",
      "lang": "en"
    }
  ],
  "symbols": {
    "unicode": "b",
    "ascii": "b",
    "html": "b",
    "latex": "\\ensuremath{\\mathrm{b}}",
    "id": "barn",
    "mathml": "<mi mathvariant='normal'>b</mi>"
  },
  "identifiers": [
    {
      "type": "nist",
      "id": "NISTu43"
    },
    {
      "type": "unitsml",
      "id": "u:barn"
    }
  ],
  "references": [
    {
      "type": "informative",
      "authority": "ucum",
      "uri": "ucum:unit:misc:code:b"
    },
    {
      "type": "informative",
      "authority": "qudt",
      "uri": "http://qudt.org/vocab/unit/BARN"
    }
  ],
  "short": "barn",
  "root": true,
  "composite": false,
  "quantities": [
    {
      "id": "NISTq8",
      "name": "area",
      "type": "derived"
    }
  ],
  "dimension": {
    "id": "NISTd8",
    "name": "area",
    "expression": "L2",
    "components": [
      {
        "key": "length",
        "symbol": "L",
        "power": 2
      }
    ],
    "dimensionless": false
  },
  "scale": {
    "id": "continuous_ratio",
    "name": "continuous ratio scale"
  },
  "systems": [
    {
      "id": "non-SI_acceptable",
      "name": "non-SI but acceptable",
      "short": "nonsi-acceptable",
      "acceptable": true
    }
  ],
  "root_units": null
}