kilogram, kg (unit)

{
    "$id": "https://schemas.optimade.org/defs/v1.2/units/si/1960/base/kilogram",
    "$schema": "https://schemas.optimade.org/meta/v1.2/optimade/physical_unit_definition.json",
    "title": "kilogram",
    "symbol": "kg",
    "display-symbol": "kg",
    "description": "The SI base unit of mass as defined as the mass of the international kilogram prototype, which was adopted into SI at the 11th CGPM Meeting in 1960.\n\n\"The prototype of the kilogram adopted by the International Committee; This prototype will henceforth be considered as the unit of mass;\", referring to the international prototype of the kilogram made of platinum-iridium [1st CGPM Meeting (1889)].\nThe kilogram was adopted into SI at the 11th CGPM Meeting in 1960, resolution 12.",
    "resources": [
        {
            "relation": "Definition at the 1st CGPM meeting (1889)",
            "resource-id": "https://www.bipm.org/en/committees/cg/cgpm/1-1889"
        },
        {
            "relation": "Establishment of the SI unit system at the 11th CGPM meeting (1960), resolution 12.",
            "resource-id": "https://www.bipm.org/en/committees/cg/cgpm/11-1960/resolution-12"
        },
        {
            "relation": "Wikipedia article describing the unit",
            "resource-id": "https://en.wikipedia.org/wiki/Kilogram"
        }
    ],
    "standard": {
        "name": "si",
        "year": 1960,
        "category": "base",
        "symbol": "kg"
    },
    "x-optimade-definition": {
        "label": "kilogram_si_1960_base",
        "kind": "unit",
        "format": "1.2",
        "version": "1.2.0",
        "name": "kilogram"
    }
}