{
  "address": "f0d3639e21d9b1c43bab01a685785a38",
  "category": "other",
  "question": "How many kg are in 10 lb?",
  "answer": "4.53592 kg",
  "askedBy": {
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    "display": "method deck",
    "stamped": false,
    "id": null
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  "answeredBy": "method",
  "madeAt": "2026-09-30T22:39:30.722Z",
  "validUntil": null,
  "validityClass": "forever",
  "sources": [
    {
      "label": "Guide for the Use of the International System of Units (SI)",
      "url": null
    }
  ],
  "supersedes": null,
  "supersededBy": null,
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  "answerMethod": "method",
  "unsourced": false,
  "source": {
    "kind": "standard",
    "value": "NIST Special Publication 811 (2008 edition), Appendix B.8, Table for mass (avoirdupois)",
    "retrieved_utc": "2026-09-30T19:29:48Z"
  },
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  "runOne": null,
  "cardContractVersion": "card_contract/1",
  "deck_id": "method-deck",
  "deck_title": "Method Deck",
  "method": {
    "name": "Mass conversion",
    "version": "1",
    "source_url_or_file": "methods/mass-conversion.cjs",
    "sha256_of_method_file": "ec20b6c2f7eed90caf515ff902febe7f5d074bee7b18a15dbf1c25f9dfed36e9"
  },
  "receipt": {
    "inSubstrate": false,
    "local": true,
    "modelCallsAtMint": 0,
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  },
  "method_deck": {
    "inputs": [
      {
        "name": "value",
        "type": "number",
        "unit": "from_unit",
        "required": true,
        "description": "The mass to convert"
      },
      {
        "name": "from_unit",
        "type": "string",
        "required": true,
        "description": "Unit of the input value",
        "enum": [
          "mg",
          "g",
          "kg",
          "t",
          "oz",
          "lb",
          "st"
        ]
      },
      {
        "name": "to_unit",
        "type": "string",
        "required": true,
        "description": "Unit to convert into",
        "enum": [
          "mg",
          "g",
          "kg",
          "t",
          "oz",
          "lb",
          "st"
        ]
      }
    ],
    "outputs": [
      {
        "name": "result",
        "unit": "to_unit",
        "description": "The converted mass"
      }
    ],
    "steps": [
      "Look up the exact kilogram-equivalent of from_unit and of to_unit from the NIST SP 811 table.",
      "Convert the input to kilograms: kilograms = value * kg_per(from_unit).",
      "Convert kilograms to the target unit: result = kilograms / kg_per(to_unit).",
      "Round result to 6 significant figures."
    ],
    "constants": [
      {
        "name": "mg",
        "value": 0.000001,
        "unit": "kg",
        "source": 0
      },
      {
        "name": "g",
        "value": 0.001,
        "unit": "kg",
        "source": 0
      },
      {
        "name": "kg",
        "value": 1,
        "unit": "kg",
        "source": 0
      },
      {
        "name": "t",
        "value": 1000,
        "unit": "kg",
        "source": 0
      },
      {
        "name": "oz",
        "value": 0.028349523125,
        "unit": "kg",
        "source": 0
      },
      {
        "name": "lb",
        "value": 0.45359237,
        "unit": "kg",
        "source": 0
      },
      {
        "name": "st",
        "value": 6.35029318,
        "unit": "kg",
        "source": 0
      }
    ],
    "examples": [
      {
        "name": "worked example",
        "inputs": {
          "value": 10,
          "from_unit": "lb",
          "to_unit": "kg"
        },
        "expected": {
          "answer": "4.53592 kg"
        },
        "check": "By hand: 10 lb * 0.45359237 kg/lb = 4.5359237 kg, rounded to 6 significant figures is 4.53592."
      },
      {
        "name": "test vector: stone to pounds",
        "inputs": {
          "value": 1,
          "from_unit": "st",
          "to_unit": "lb"
        },
        "expected": {
          "answer": "14.0000 lb"
        },
        "check": "By definition 1 stone = 14 lb exactly: 6.35029318 kg / 0.45359237 kg/lb = 14 exactly."
      },
      {
        "name": "test vector: kilograms to ounces",
        "inputs": {
          "value": 5,
          "from_unit": "kg",
          "to_unit": "oz"
        },
        "expected": {
          "answer": "176.370 oz"
        },
        "check": "By hand: 5 kg / 0.028349523125 kg/oz = 176.3698...; rounded to 6 significant figures is 176.370."
      }
    ],
    "disclaimer": null,
    "deck_category": "units"
  },
  "status": "minted",
  "kind": "method",
  "provenanceClass": "own_question",
  "provenance": {
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    "chain": [
      {
        "source": {
          "kind": "standard",
          "value": "NIST Special Publication 811 (2008 edition), Appendix B.8, Table for mass (avoirdupois)",
          "retrieved_utc": "2026-09-30T19:29:48Z"
        },
        "sha256": "7a3dc43064686e7f948f244c1b8a43f07d3e5bddb70df15048032ed073f2dbb1",
        "supersedes": null,
        "added_utc": "2026-09-30T22:39:30.722Z",
        "added_by": "method:Mass conversion",
        "why": "the method that computed this answer",
        "check": null,
        "status_label": "pending",
        "signature": null
      }
    ]
  }
}